Form 10-Q - Quarterly report [Sections 13 or 15(d)]

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q


(Mark One)
☒			QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
			For the quarterly period ended June 30, 2023
			OR
☐			TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
			For the transition period from _________________to _________________

Commission File Number 001-33987

HERITAGE-CRYSTAL CLEAN, INC.

(Exact name of registrant as specified in its charter)


Delaware						26-0351454
State or other jurisdiction of						(I.R.S. Employer
Incorporation						Identification No.)

2000 Center Drive

Suite East C300

Hoffman Estates, IL 60192

(Address of principal executive offices and zip code)

Registrant’s telephone number, including area code: (847) 836-5670

Securities registered pursuant to Section 12(b) of the Act:

Title of each Class

Trading Symbol

Name of Exchange on which registered

Common Stock, par value $0.01 per share

HCCI

NASDAQ

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x No o

Indicate by check mark whether the registrant has submitted electronically, every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes x No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See definitions of “large accelerated filer,” “accelerated filer,” "smaller

reporting company," and “emerging growth company” in Rule 12b-2 of the Exchange Act.


Large accelerated filer o		Accelerated filer x
Non-accelerated filer o	(Do not check if a smaller reporting company)	Smaller reporting company ☐
		Emerging growth company ☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes ☐ No x

On August 8, 2023, there were outstanding 24,370,405 shares of Common Stock, $0.01 par value, of Heritage-Crystal Clean, Inc.

Table of Contents


PART I

ITEM 1. FINANCIAL STATEMENTS			4
ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS			33
ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK			42
ITEM 4. CONTROLS AND PROCEDURES			42

PART II




ITEM 1. LEGAL PROCEEDINGS			43
ITEM 1A. RISK FACTORS			43
ITEM 6 . EXHIBITS			46

SIGNATURES			47

PART I

ITEM 1. FINANCIAL STATEMENTS

Heritage-Crystal Clean, Inc.

Condensed Consolidated Balance Sheets

(In Thousands, Except Share and Par Value Amounts)


	June 30, 2023		December 31, 2022
	(unaudited)
ASSETS
Current assets:
Cash and cash equivalents	$	33,100	$	22,053
Accounts receivable - net	104,704		114,408
Inventory - net	47,024		40,727
Assets held for sale	—		1,125
Other current assets	14,652		12,989
Total current assets	199,480		191,302
Property, plant and equipment - net	232,318		222,942
Right of use assets	126,290		123,742
Equipment at customers - net	30,157		26,465
Software and intangible assets - net	97,091		102,335
Goodwill	112,236		112,236
Other assets	15,219		15,219
Total assets	$	812,791	$	794,241

LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable	$	52,602	$	55,087
Current portion of lease liabilities	28,490		27,277
Contract liabilities - net	3,259		2,525
Accrued salaries, wages, and benefits	9,339		12,443
Taxes payable	3,211		6,037
Other current liabilities	10,553		12,382

Total current liabilities	107,454		115,751
Lease liabilities, net of current portion	103,426		100,738
Other long term liabilities	770		986
Long-term debt - net	84,479		89,383
Deferred income taxes	60,765		57,155
Total liabilities	$	356,894	$	364,013

STOCKHOLDERS' EQUITY:
Common stock - 36,000,000 shares authorized at $0.01 par value, 23,687,649 and 23,593,163 shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively	$	237	$	236
Additional paid-in capital	208,913		208,533
Retained earnings	247,057		221,826
Accumulated other comprehensive loss	(310)		(367)
Total stockholders' equity	455,897		430,228

Total liabilities and stockholders' equity	$	812,791	$	794,241

See accompanying notes to financial statements.

Heritage-Crystal Clean, Inc.

Condensed Consolidated Statements of Income

(In Thousands, Except per Share Amounts)

(Unaudited)


		Second Quarter Ended,				First Half Ended,
		June 30, 2023 (91 days)		June 18, 2022 (84 days)		June 30, 2023 (181 days)		June 18, 2022 (168 days)

Revenues
	Service revenues	$	121,342	$	75,584	$	240,794	$	144,500
	Product revenues	62,141		74,789		128,481		139,262
	Rental income	8,683		6,274		16,372		12,251
Total revenues		$	192,166	$	156,647	$	385,647	$	296,013

Operating expenses
	Operating costs	$	146,387	$	104,755	$	286,448	$	206,538
	Selling, general, and administrative expenses	20,361		15,024		38,061		28,759
	Depreciation and amortization	11,802		6,777		23,969		13,285
	Other (income) expense - net	(265)		1,001		(734)		791
Operating income		13,881		29,090		37,903		46,640
Interest expense – net		1,929		250		3,743		473
Income before income taxes		11,952		28,840		34,160		46,167
Provision for income taxes		3,310		7,733		8,929		12,182

Net income		$	8,642	$	21,107	$	25,231	$	33,985

Net income per share: basic		$	0.36	$	0.90	$	1.07	$	1.45
Net income per share: diluted		$	0.36	$	0.89	$	1.06	$	1.44

Number of weighted average shares outstanding: basic		23,681		23,489		23,665		23,482
Number of weighted average shares outstanding: diluted		23,931		23,644		23,898		23,640

See accompanying notes to financial statements.

Heritage-Crystal Clean, Inc.

Condensed Consolidated Statements of Comprehensive Income

(In Thousands)

(Unaudited)


		Second Quarter Ended,				First Half Ended,
		June 30, 2023 (91 days)		June 18, 2022 (84 days)		June 30, 2023 (181 days)		June 18, 2022 (168 days)

Net income		$	8,642	$	21,107	$	25,231	$	33,985
	Other comprehensive income:
	Currency translation adjustments	54		(121)		57		(75)
	Total other comprehensive income (loss):	$	54	$	(121)	$	57	$	(75)
Comprehensive income		$	8,696	$	20,986	$	25,288	$	33,910

See accompanying notes to financial statements.

Heritage-Crystal Clean, Inc.

Condensed Consolidated Statement of Stockholders’ Equity

(In Thousands, Except Share Amounts)

For the Second Quarter Ended June 30, 2023 and June 18, 2022

(Unaudited)


Second Quarter Ended,
June 30, 2023
	Shares	Par Value Common		Additional Paid–in Capital		Retained Earnings		Accumulated Other Comprehensive Loss		Total Equity

Balance, March 31, 2023	23,664,515	$	237	$	207,673	$	238,415	$	(364)	$	445,961
Net income	—	—		—		8,642		—		8,642
Currency translation adjustment	—	—		—		—		54		54

Issuance of common stock – ESPP	5,070	—		170		—		—		170
Share-based compensation	18,064	—		1,070		—		—		1,070

Balance at June 30, 2023	23,687,649	$	237	$	208,913	$	247,057	$	(310)	$	455,897



Second Quarter Ended,
June 18, 2022
	Shares	Par Value Common		Additional Paid–in Capital		Retained Earnings		Accumulated Other Comprehensive Loss		Total Equity

Balance, March 26, 2022	23,477,764	$	235	$	206,390	$	149,945	$	(120)	$	356,450
Net income	—	—		—		21,107		—		21,107
Currency translation adjustment	—	—		—		—		(121)		(121)


Issuance of common stock – ESPP	4,794	—		134		—		—		134
Share-based compensation	11,487	—		1,174		—		—		1,174
Share repurchases to satisfy tax withholding obligations	—	—		(1,402)		—		—		(1,402)
Balance at June 18, 2022	23,494,045	$	235	$	206,296	$	171,052	$	(241)	$	377,342



First Half Ended,
June 30, 2023
	Shares	Par Value Common		Additional Paid–in Capital		Retained Earnings		Accumulated Other Comprehensive Loss		Total Equity

Balance, December 31, 2022	23,593,163	$	236	$	208,533	$	221,826	$	(367)	$	430,228
Net income	—	—		—		25,231		—		25,231


Currency translation adjustment	—	—		—		—		57		57
Issuance of common stock – ESPP	9,845	—		318		—		—		318
Share-based compensation	84,641	1		2,197		—		—		2,198
Share repurchases to satisfy tax withholding obligations	—	—		(2,135)		—		—		(2,135)
Balance at June 30, 2023	23,687,649	$	237	$	208,913	$	247,057	$	(310)	$	455,897



First Half Ended,
June 18, 2022
	Shares	Par Value Common		Additional Paid–in Capital		Retained Earnings		Accumulated Other Comprehensive Income		Total Equity

Balance, January 1, 2022	23,473,931	$	235	$	204,920	$	137,067	$	(166)	$	342,056
Net income	—	—		—		33,985		—		33,985


Currency translation adjustment	—	—		—		—		(75)		(75)
Issuance of common stock – ESPP	8,627	—		251		—		—		251
Share-based compensation	11,487	—		2,527		—		—		2,527
Share repurchases to satisfy tax withholding obligations	—	—		(1,402)		—		—		(1,402)
Balance at June 18, 2022	23,494,045	$	235	$	206,296	$	171,052	$	(241)	$	377,342

Heritage-Crystal Clean, Inc.

Condensed Consolidated Statements of Cash Flows

(In Thousands)

(Unaudited)


	First Half Ended,
	June 30, 2023 (181 days)		June 18, 2022 (168 days)
Cash flows from Operating Activities:
Net income	$	25,231	$	33,985
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,969		13,285
Provision for civil action settlement	—		750

Uncollectible provision	1,270		453
Share-based compensation	2,455		2,785
Deferred taxes	3,610		944
Other, net	(10)		1,099
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	8,434		(18,207)
(Increase) in inventory	(6,297)		(6,685)
Decrease (increase) in other current assets	(538)		2,345
(Decrease) increase in accounts payable	(3,462)		8,091
(Decrease) increase in accrued liabilities	(7,823)		323

Cash provided by operating activities	$	46,839	$	39,168

Cash flows from Investing Activities:
Capital expenditures	$	(26,899)	$	(15,936)
Proceeds from sale of assets	1,578		96
Investment in Retriev	—		(3,000)

Cash used in investing activities	$	(25,321)	$	(18,840)

Cash flows from Financing Activities:
Repayments under line of credit	(5,000)		—

Repayment of principal on finance leases	(3,654)		(1,686)
Share repurchases to satisfy tax withholding obligations	(2,135)		(1,402)
Proceeds from the issuance of common stock	318		251


Cash used in financing activities	$	(10,471)	$	(2,837)
Net increase in cash and cash equivalents	11,047		17,491
Cash and cash equivalents, beginning of period	22,053		56,269
Cash and cash equivalents, end of period	$	33,100	$	73,760

Supplemental disclosure of cash flow information:
Income taxes paid	$	9,683	$	11,796
Cash paid for interest	3,558		140
Supplemental disclosure of non-cash information:
Payables for construction in progress	1,926		874

See accompanying notes to financial statements.

HERITAGE-CRYSTAL CLEAN, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

June 30, 2023

(1) ORGANIZATION AND NATURE OF OPERATIONS

Heritage-Crystal Clean, Inc., a Delaware corporation and its subsidiaries (collectively the “Company”), provide parts cleaning, used oil re-refining, hazardous and non-hazardous waste disposal, emergency and spill response, and industrial and field services to vehicle maintenance businesses, manufacturers and other industrial businesses, as well as utilities and governmental entities. The Company owns and operates a used oil re-refinery where it re-refines used oils and sells high quality base oil for use in the manufacture of finished lubricants as well as other re-refinery products. The Company also has multiple locations where it dehydrates used oil. The oil processed at these locations is primarily sold as recycled fuel oil. The Company also operates twelve non-hazardous waste processing facilities, as well as five antifreeze recycling facilities at which it produces virgin-quality antifreeze. The Company's locations are in the United States and Ontario, Canada. The Company conducts its primary business operations through Heritage-Crystal Clean, LLC, its wholly owned subsidiary, and all intercompany balances have been eliminated in consolidation.

•"Environmental Services," which consists of the Company's parts cleaning, containerized hazardous and non-hazardous waste collection and hazardous waste disposal, wastewater vacuum, and antifreeze recycling activities. Product revenues include sales of solvent, machines, absorbent, accessories, and antifreeze; service revenues include servicing of parts cleaning machines, containerized hazardous and non-hazardous waste removal services, and wastewater vacuum services through the branch network. Rental income includes embedded lease income from certain parts cleaning contracts.

•"Oil Business," which consists of the Company's used oil collection, recycled fuel oil sales, used oil re-refining activities, and used oil filter removal and disposal services. Product revenues primarily consist of sales of re-refined base oil, re-refinery co-products and recycled fuel oil; service revenues include revenues from used oil collection activities, collecting and disposing of wastewater and removal and disposal of used oil filters.

•"Industrial and Field Services," which consists of the Company's industrial and field services and non-hazardous waste processing and includes revenues related to industrial and field services, emergency and spill response as well as processing of non-hazardous waste.

Due to the Company's integrated business model, it is impracticable to separately present costs of tangible products and costs of services.

No customer represented greater than 10% of consolidated revenues for any of the periods presented. Intercompany revenues have been eliminated. All segments operate in the United States and, to an immaterial degree, in Ontario, Canada. As such, the Company is not disclosing operating results by geographic segment.

Beginning with our 2023 fiscal year, we changed our financial reporting cycle to a calendar year-end and end-of-month quarterly reporting cycle. Accordingly, our 2023 fiscal year began on January 1, 2023 (the day after the end of the 2022 fiscal year) and will end on December 31, 2023, and our 2023 quarters include the three month periods ending March 31, June 30, September 30, and December 31. Prior to 2023, our fiscal year was a 52 or 53 week fiscal year that ended on the Saturday nearest to December 31, and our quarterly reporting cycle included twelve week periods for the first, second, and third quarters and a sixteen week period (or in some cases a seventeen week period) for the fourth quarter. We have not restated, and do not plan to restate, historical results.

The table below shows the reporting periods as we refer to them in this report, their date ranges, and the number of days in each:

Reporting Period

Date Range

Number of Days

2023 second quarter

April 1, 2023 - June 30, 2023

2022 second quarter

March 27, 2022 - June 18, 2022

2023 first half

January 1, 2023 - June 30, 2023

181

2022 first half

January 2, 2022 - June 18, 2022

168

2023 fiscal year

January 1, 2023 - December 31, 2023

365

2022 fiscal year

January 2, 2022 - December 31, 2022

364

As a result of the change in our financial reporting cycle, our 2023 second quarter and 2023 first half had 7 and 13 more calendar days of activity, respectively, than our 2022 second quarter and 2022 first half, respectively. While our 2023 full fiscal year will have one additional day of activity as compared to our 2022 full fiscal year, our 2023 fourth quarter will have 20 fewer days of activity than the corresponding period in our 2022 fiscal year.

(2) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

The Company's significant accounting policies are described in Note 2, "Summary of Significant Accounting Policies," in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2022. You should read the condensed consolidated financial statements in conjunction with our consolidated financial statements and related notes in our Annual Report on Form 10-K filed with the SEC on March 1, 2023. There have been no material changes in these policies or their application during the second quarter of fiscal 2023 except for the fiscal year change as further described in Note 1.

In the opinion of management, all adjustments and disclosures necessary for the fair presentation of these interim statements have been included

(3) BUSINESS COMBINATIONS

On August 3, 2022, Heritage-Crystal Clean, LLC, completed its acquisition of all of the capital stock of Patriot Environmental Services, Inc. ("Patriot"), a leading provider of environmental services across the Western United States specializing in emergency response, industrial services, OSRO spill response and a wide variety of waste services. Total consideration for the acquisition was approximately $156.9 million in cash subject to various adjustments such as a working capital adjustment and seller indemnification obligations. To date, there have been no adjustments to the purchase price. Goodwill recognized from the acquisition of Patriot, represents the excess of the estimated purchase consideration transferred over the estimated fair value of the assets acquired and liabilities assumed. The Company has not finalized the purchase price allocation for the acquisition as of June 30, 2023. The following balances of the purchase price allocation are subject to change as a result of any working capital adjustments and seller indemnification obligations: other current assets, goodwill, and accounts payable and accruals. Factors leading to goodwill being recognized are the Company’s expectation of synergies from combining operations of Patriot, and the Company as well as the value of intangible assets that are not separately recognized, such as the assembled workforce. Transaction costs incurred in conjunction with the acquisition of Patriot were approximately $1.2 million. The results of Patriot are consolidated into the Company’s Industrial and Field Services segment from the date of acquisition.

The following table summarizes the estimated fair values of the assets acquired, net of cash acquired, related to Patriot at the acquisition date:



(thousands)	Patriot Environmental Services, Inc.(1)

Accounts receivable	$	25,381

Other current assets	2,034

Property, plant, & equipment	33,968

Intangible assets	62,200
Goodwill	62,541
Accounts payable and accruals	(12,929)

Deferred tax liabilities	(16,313)



Total purchase price, net of cash acquired	$	156,882



Less: placed in escrow	2,780
Net cash paid	$	154,102

(1) The Company is still in the process of finalizing the purchase price allocation for the acquisition and therefore the following balances are subject to change as a result of any working capital adjustments and seller indemnification obligations: other current assets, goodwill, and accounts payable and accruals.

Unaudited Pro Forma Financial Information

The pro forma financial information in the table below presents the combined results of the Company as if the Patriot acquisition had occurred on January 1, 2022. The pro forma information is shown for illustrative purposes only and is not

necessarily indicative of future results of operations of the Company or results of operations of the Company that would have actually occurred had the transactions been in effect for the periods presented.


	Second Quarter Ended,
(thousands, except per share data)	June 30, 2023 (91 days)		June 18, 2022 (84 days)
Total revenues	$	192,166	$	184,361
Net income	$	8,642	$	21,065

Net income per share: basic	$	0.36	$	0.90
Net income per share: diluted	$	0.36	$	0.89


	First Half Ended,
(thousands, except per share data)	June 30, 2023 (181 days)		June 18, 2022 (168 days)
Total revenues	$	385,647	$	353,806
Net income	$	25,231	$	32,652

Net income per share: basic	$	1.07	$	1.39
Net income per share: diluted	$	1.06	$	1.38

(4) REVENUE

We account for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. Revenue is recognized when our performance obligations under the terms of a contract with our customers are satisfied. Recognition occurs when the Company transfers control by completing the specified services at the point in time the customer benefits from the services performed or once our products are delivered. The majority of revenue is recognized at a point in time, except for rental income which is recognized on an over time basis. The Company measures progress toward complete satisfaction of a performance obligation satisfied over time using a cost-based input method. This method of measuring progress provides a faithful depiction of the transfer of goods or services because the costs incurred are expected to be substantially proportionate to the Company’s satisfaction of the performance obligation. Revenue is measured as the amount of consideration we expect to receive in exchange for completing our performance obligations. Sales tax and other taxes we collect with revenue-producing activities are excluded from revenue. In the case of contracts with multiple performance obligations, the Company allocates the transaction price to each performance obligation based on the relative stand-alone selling prices of the various goods and/or services encompassed by the contract. We do not have any material significant payment terms as payment is generally due within 30 days after the performance obligation has been satisfactorily completed. The Company has elected the practical expedient to recognize the incremental costs of obtaining a contract as an expense when incurred if the amortization period of the asset that we otherwise would have recognized is one year or less. In applying the guidance in Topic 606, there were no judgments or estimates made that the Company deems significant.

Contract Balances — Contract assets primarily relate to the Company’s rights to consideration for work completed in relation to its services performed but not billed at the reporting date. Contract liabilities primarily consist of advance payments of performance obligations yet to be fully satisfied in the period reported. Our contract liabilities and contract assets are reported in a net position at the end of each reporting period.

We disaggregate our revenue from contracts with customers by major lines of business for each of our segments, as we believe it best depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. As further described in Note 10, prior period segment results presented for comparative purposes below have been recast to reflect the newly reportable segments.

The following table disaggregates our revenue by major lines:


	Second Quarter Ended,
	June 30, 2023 (91 days)								June 18, 2022 (84 days)
Total Net Sales by Major Lines of Business (thousands)	Environmental Services		Oil Business		Industrial and Field Services		Total		Environmental Services		Oil Business		Industrial and Field Services		Total
Parts Cleaning, Containerized Waste, & related products/services	$	57,885	$	—	$	1,455	$	59,340	$	49,217	$	—	$	1,103	$	50,320
Vacuum Services & Wastewater Treatment	21,116		—		6,458		27,574		15,089		—		6,061		21,150
Industrial & Field Services	—		—		38,556		38,556		—		—		6,539		6,539
Antifreeze Business	8,439		—		—		8,439		7,118		—		—		7,118
Environmental Services - Other	453		—		—		453		486		—		—		486
Re-refinery Product Sales	—		41,820		—		41,820		—		54,198		—		54,198
Oil Collection Services & RFO	—		6,002		—		6,002		—		9,253		—		9,253
Oil Filter Business	—		1,299		—		1,299		—		1,309		—		1,309
Revenues from Contracts with Customers	87,893		49,121		46,469		183,483		71,910		64,760		13,703		150,373
Rental Income	8,072		11		600		8,683		6,265		9		—		6,274
Total Revenues	$	95,965	$	49,132	$	47,069	$	192,166	$	78,175	$	64,769	$	13,703	$	156,647



	First Half Ended,
	June 30, 2023 (181 days)								June 18, 2022 (168 days)
Total Net Sales by Major Lines of Business (thousands)	Environmental Services		Oil Business		Industrial and Field Services		Total		Environmental Services		Oil Business		Industrial and Field Services		Total
Parts cleaning, containerized waste, & related products/services	$	114,543	$	—	$	2,924	$	117,467	$	95,340	$	—	$	1,836	$	97,176
Wastewater Vacuum Services	41,460		—		12,883		54,343		28,397		—		10,144		38,541
Field Services	—		—		76,304		76,304		—		—		12,829		12,829
Antifreeze Business	18,115		—		—		18,115		14,774		—		—		14,774
Environmental Services - Other	975		—		—		975		981		—		—		981
Re-refinery Product Sales	—		88,629		—		88,629		—		103,337		—		103,337
Oil Collection Services & RFO	—		10,740		—		10,740		—		13,566		—		13,566
Oil Filter Business	—		2,702		—		2,702		—		2,558		—		2,558
Revenues from Contracts with Customers	175,093		102,071		92,111		369,275		139,492		119,461		24,809		283,762
Rental income	15,639		17		716		16,372		12,228		23		—		12,251
Total Revenues	$	190,732	$	102,088	$	92,827	$	385,647	$	151,720	$	119,484	$	24,809	$	296,013

The following table provides information about contract assets and contract liabilities from contracts with customers:


(thousands)	June 30, 2023		December 31, 2022
Contract assets	$	—	$	133
Contract liabilities	3,259		2,658
Contract liabilities - net	$	3,259	$	2,525

During the fiscal quarter ended June 30, 2023, the Company recognized no revenue that was included in the contract liabilities balance as of December 31, 2022. During the first half ended June 30, 2023, the Company recognized $2.5 million of revenue that was included in the contract liabilities balance as of December 31, 2022. The Company has no assets recognized from costs to obtain or fulfill a contract with a customer. We do not disclose the value of unsatisfied performance obligations for contracts with an original expected length of one year or less.

(5) ACCOUNTS RECEIVABLE

Accounts Receivable — Net, includes amounts billed to and currently due from customers. The amounts due are stated at their net estimated realizable value. The allowance for uncollectible accounts is our best estimate of the amount of probable lifetime-expected credit losses in existing accounts receivable and is determined based on our historical collections experience, age of the receivable, knowledge of the customer and the condition of the general economy and industry as a whole. The Company does not have any off-balance-sheet credit exposure related to its customers.

Accounts receivable for the second quarter ended June 30, 2023, and the fiscal year ended December 31, 2022 consisted of the following:


(thousands)	June 30, 2023		December 31, 2022
Trade	$	105,263	$	111,118
Less: allowance for uncollectible accounts	5,527		4,496
Trade - net	99,736		106,622
Related parties	4,437		6,777
Other	531		1,009
Total accounts receivable - net	$	104,704	$	114,408

The following table provides the changes in the Company’s allowance for uncollectible accounts for the first half ended June 30, 2023, and the fiscal year ended December 31, 2022:



(thousands)	June 30, 2023		December 31, 2022
Balance at beginning of period	$	4,496	$	2,928
Provision for uncollectible accounts	1,270		2,269
Accounts written off, net of recoveries	(239)		(701)
Balance at end of period	$	5,527	$	4,496

(6) INVENTORY

The carrying value of inventory consisted of the following:


(thousands)	June 30, 2023		December 31, 2022
Solvents and solutions	$	11,829	$	10,792
Used oil and processed oil	18,991		14,904
Machines	7,206		6,329
Drums and supplies	6,543		6,476
Other	2,910		2,666
Total inventory	47,479		41,167
Less: machine refurbishing reserve	455		440
Total inventory - net	$	47,024	$	40,727

Inventory consists primarily of used oil, processed oil, solvents and solutions, new and refurbished parts cleaning machines, drums and supplies, and other items. Inventories are valued at the lower of first-in, first-out (FIFO) cost or net realizable value, net of any reserves for excess, obsolete, or unsalable inventory. The Company monitors its inventory levels at each of its locations and evaluates inventories for excess or slow-moving items. If circumstances indicate the cost of inventories exceed their recoverable value, inventories are reduced to net realizable value. The Company had no inventory write downs during the second quarter and first half of fiscal 2023 or 2022.

(7) GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill is measured as a residual amount as of the acquisition date, which in most cases results in measuring goodwill as an excess of the purchase consideration transferred plus the fair value of any noncontrolling interest in the acquiree over the fair value of the net assets acquired, including any contingent consideration. The Company tests goodwill for impairment annually in the fourth quarter and in interim periods if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Company's determination of fair value requires certain assumptions and estimates, such as margin expectations, market conditions, growth expectations, expected changes in working capital, etc., regarding expected future profitability and expected future cash flows. The Company reports and tests goodwill for impairment only in its Environmental Services and Industrial and Field Services reporting units. As further discussed in Note 10, December 31, 2022 numbers presented for comparative purposes below have been recast to reflect the newly reportable segments. The Company analyzed the relative fair values of each acquisition and assigned goodwill to the respective segment that the results of each acquisition are consolidated into.

The following table shows changes to our goodwill balances by segment from December 31, 2022 to June 30, 2023:


(thousands)	Environmental Services		Industrial and Field Services		Total

Goodwill at December 31, 2022
Gross carrying amount	$	37,650	$	74,586	$	112,236

Net book value at December 31, 2022	$	37,650	$	74,586	$	112,236

Goodwill at June 30, 2023
Gross carrying amount	37,650		74,586		$	112,236

Net book value at June 30, 2023	$	37,650	$	74,586	$	112,236

The following is a summary of software and other intangible assets:


	June 30, 2023						December 31, 2022
(thousands)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer & supplier relationships	$	62,268	$	28,655	$	33,613	$	62,268	$	25,762	$	36,506
Permits	60,690		4,577		56,113		60,690		2,697		57,993
Software	10,090		3,992		6,098		13,643		7,378		6,265
Non-compete agreements	4,413		3,799		614		4,421		3,665		756
Patents, formulae, and licenses	1,769		1,003		766		1,769		971		798
Other*	601		714		(113)		597		580		17
Total software and intangible assets	$	139,831	$	42,740	$	97,091	$	143,388	$	41,053	$	102,335

*Other intangibles include an above market lease acquired in September 2021 that had a fair value of ($0.7) million upon acquisition and is being accreted over the remaining useful life of the lease.

Amortization expense was $2.9 million for the second quarter ended June 30, 2023, and $1.4 million for the second quarter ended June 18, 2022. Amortization expense was $5.6 million for the first half ended June 30, 2023, and $2.8 million for the first half ended June 18, 2022.

The weighted average useful lives of software and other intangibles are as follows:


						Weighted Average Useful Life (years)
Permits						17
Patents, formulae, & licenses						15
Customer and supplier relationships						12
Software						9
Non-compete agreements						5
Other						7

The estimated amortization expense for the remainder of fiscal 2023 and each of the five succeeding fiscal years is as follows:


(millions)
Fiscal Year						Amortization Expense
2023						$4.8
2024						8.5
2025						7.5
2026						7.0
2027						6.9
2028						6.8

The preceding expected amortization expense is an estimate. Actual amounts of amortization expense may differ from estimated amounts due to additional intangible asset acquisitions, the finalization of the fair value of intangible assets that have been acquired from business combinations, disposal of intangible assets, accelerated amortization of intangible assets, and other events.

(8) ACCOUNTS PAYABLE

Accounts payable consisted of the following:


(thousands)	June 30, 2023		December 31, 2022
Accounts payable	$	51,763	$	54,935
Accounts payable - related parties	839		152
Total accounts payable	$	52,602	$	55,087

(9) DEBT AND FINANCING ARRANGEMENTS

Bank Credit Facility

On March 18, 2021, Heritage-Crystal Clean, LLC, (the “Company”), entered into an Amended and Restated Credit Agreement (the "Agreement"), by and among the Company, its parent, Heritage-Crystal Clean, Inc., and the Company’s subsidiaries identified therein and Bank of America, N.A., as administrative agent, JPMorgan Chase Bank, N.A., and Wells Fargo Bank, National Association. The new Agreement provides for borrowings of up to $100.0 million, in the form of a revolving facility, of which $15 million can be used in the form of a Swing Line loan. The Agreement also provided for up to an additional $50.0 million of borrowings using an accordion feature upon approval of the lenders. On August 3, 2022, the Company entered into an Amendment (Amendment No. 1 to the Agreement "the Amendment") which increased the amount of borrowing under the revolving credit line to $150.0 million. The Company utilized the credit line to finance $115.0 million of the acquisition of Patriot Environmental Services Inc. (see Note 3). The Amendment also provides for up to an additional $50.0 million of borrowings under an accordion feature upon approval of the lenders.

Loans made under the Agreement, as amended, may be Base Rate Loans or Secured Overnight Financing Rate ("SOFR") Loans, at the election of the Borrower subject to certain exceptions. Base Rate Loans have an interest rate equal to (i) the higher of (a) the federal funds rate plus 0.5%, (b) the SOFR plus a margin of 1%, or (c) Bank of America's prime rate, plus a margin of 1.00%. SOFR rate loans have an interest rate equal to (i) the SOFR rate plus (ii) a variable margin of between 1.50% and 2.25% depending on the Company's total leverage ratio. Amounts borrowed under the Agreement are secured by a security interest in substantially all of the Company's tangible and intangible assets. In August 2022, the Company incurred an additional $0.1 million of debt issuance costs related to the amendment of the credit agreement and drawdown.

The Company's weighted average interest rate for all debt for the second quarter ended June 30, 2023 was 6.6%.

The Credit Agreement contains customary terms and provisions (including representations, covenants, and conditions) for transactions of this type. Certain covenants, among other things, restrict the Company's and its subsidiaries' ability to incur indebtedness, grant liens, make investments and sell assets. The Credit Agreement also contains customary events of default, covenants and representations and warranties. Financial covenants include:

•An interest coverage ratio (based on interest expense and EBITDA) of at least 3.5 to 1.0;

•A total leverage ratio no greater than 3.0 to 1.0, provided that in the event of a permitted acquisition having an aggregate consideration equal to $10.0 million or more, at the Borrower’s election, the foregoing 3.00 to 1.00 shall be deemed to be 3.50 to 1.00 for the fiscal quarter in which such permitted acquisition occurs and the three immediately following fiscal quarters and will thereafter revert to 3.00 to 1.00.

The Credit Agreement places certain limitations on acquisitions and the payment of dividends.

Long-term debt at June 30, 2023 and December 31, 2022 consisted of the following:


(thousands)	June 30, 2023		December 31, 2022
Long-term debt	$	85,000	$	90,000
Less: unamortized debt issuance costs	521		617

Long-term debt - net	$	84,479	$	89,383

As of June 30, 2023 and December 31, 2022, the Company was in compliance with all covenants under its Credit Agreement. As of June 30, 2023 and December 31, 2022, the Company had $6.0 million of standby letters of credit issued for both periods, and $59.0 million and $54.0 million was available for borrowing under the bank credit facility, respectively.

(10) SEGMENT INFORMATION

Effective January 1, 2023, the Company revised its reportable segments as a result of the Patriot Environmental Services, Inc. acquisition. Previously we had two reportable segments: "Environmental Services," and "Oil Business." Under the revised segment presentation, the Company now has three reportable segments: "Environmental Services," "Oil Business," and "Industrial and Field Services." The Environmental Services segment consists primarily of the Company's parts cleaning, containerized waste management, wastewater vacuum services, and antifreeze recycling activities. The Oil Business segment consists primarily of the Company's used oil collection, used oil re-refining activities, and the dehydration of used oil to be sold as recycled fuel oil. The Industrial and Field Services segment consists of the Company's industrial and field services, emergency and spill response services, as well as the activities at our non-hazardous waste processing facilities. Prior period segment results presented for comparative purposes below have been recast to reflect the newly reportable segment as a separate segment.

Segment results for the second quarter ended June 30, 2023 and June 18, 2022 were as follows:


Second Quarter Ended,
June 30, 2023 (91 days)
(thousands)		Environmental Services		Oil Business		Industrial and Field Services		Corporate and Eliminations		Consolidated

Revenues
	Service revenues	$	72,018	$	2,855	$	46,469	$	—	$	121,342
	Product revenues	15,875		46,266		—		—		62,141
	Rental income	8,072		11		600		—		8,683
Total revenues		$	95,965	$	49,132	$	47,069	$	—	$	192,166
Operating expenses
	Operating costs	68,459		40,781		37,147		—		146,387
	Operating depreciation and amortization	3,641		2,675		2,398		—		8,714
Profit before corporate selling, general, and administrative expenses		$	23,865	$	5,676	$	7,524	$	—	$	37,065
Selling, general, and administrative expenses								20,361		20,361
Depreciation and amortization from SG&A								3,088		3,088
Total selling, general, and administrative expenses								$	23,449	$	23,449
Other (income) - net								(265)		(265)
Operating income										13,881
Interest expense – net								1,929		1,929
Income before income taxes										$	11,952


Second Quarter Ended,
June 18, 2022 (84 days)
(thousands)		Environmental Services		Oil Business		Industrial and Field Services		Corporate and Eliminations		Consolidated

Revenues
	Service revenues	$	59,277	$	2,604	$	13,703	$	—	$	75,584
	Product revenues	12,633		62,156		—		—		74,789
	Rental income	6,265		9		—		—		6,274
Total revenues		$	78,175	$	64,769	$	13,703	$	—	$	156,647
Operating expenses
	Operating costs	56,812		35,841		12,102		—		104,755
	Operating depreciation and amortization	2,769		2,125		423		—		5,317
Profit before corporate selling, general, and administrative expenses		$	18,594	$	26,803	$	1,178	$	—	$	46,575
Selling, general, and administrative expenses								15,024		15,024
Depreciation and amortization from SG&A								1,460		1,460
Total selling, general, and administrative expenses								$	16,484	$	16,484
Other expense - net								1,001		1,001
Operating income										29,090
Interest expense – net								250		250
Income before income taxes										$	28,840


First Half Ended,
June 30, 2023 (181 days)
(thousands)		Environmental Services		Oil Business		Industrial and Field Services		Corporate and Eliminations		Consolidated

Revenues
	Service revenues	$	143,018	$	5,665	$	92,111	$	—	$	240,794
	Product revenues	32,075		96,406		—		—		128,481
	Rental income	15,639		17		716		—		16,372
Total revenues		$	190,732	$	102,088	$	92,827	$	—	$	385,647
Operating expenses
	Operating costs	136,999		77,079		72,370		—		286,448
	Operating depreciation and amortization	7,140		5,280		5,476		—		17,896
Profit before corporate selling, general, and administrative expenses		$	46,593	$	19,729	$	14,981	$	—	$	81,303
Selling, general, and administrative expenses								38,061		38,061
Depreciation and amortization from SG&A								6,073		6,073
Total selling, general, and administrative expenses								$	44,134	$	44,134
Other (income) - net								(734)		(734)
Operating income										37,903
Interest expense – net								3,743		3,743
Income before income taxes										$	34,160


First Half Ended,
June 18, 2022 (168 days)
(thousands)		Environmental Services		Oil Business		Industrial and Field Services		Corporate and Eliminations		Consolidated

Revenues
	Service revenues	$	114,479	$	5,212	$	24,809	$	—	$	144,500
	Product revenues	25,013		114,249		—		—		139,262
	Rental income	12,228		23		—		—		12,251
Total revenues		$	151,720	$	119,484	$	24,809	$	—	$	296,013
Operating expenses
	Operating costs	114,837		70,006		21,695		—		206,538
	Operating depreciation and amortization	5,236		4,209		845		—		10,290
Profit before corporate selling, general, and administrative expenses		$	31,647	$	45,269	$	2,269	$	—	$	79,185
Selling, general, and administrative expenses								28,759		28,759
Depreciation and amortization from SG&A								2,995		2,995
Total selling, general, and administrative expenses								$	31,754	$	31,754
Other expense - net								791		791
Operating income										46,640
Interest expense – net								473		473
Income before income taxes										$	46,167

Intersegment revenues for the first half of fiscal 2023 and fiscal 2022 in the Industrial & Field services segment were $5.2 million and $3.9 million, respectively. The Environmental Services segment and the Oil Business segment had no intersegment revenues for the second quarter of fiscal 2023 and fiscal 2022.

Total assets by segment as of June 30, 2023 and December 31, 2022 were as follows:


(thousands)		June 30, 2023		December 31, 2022
Total Assets:
	Environmental Services	$	258,031	$	253,906
	Oil Business	186,153		190,862
	Industrial and Field Services	290,210		283,683
	Unallocated Corporate Assets	78,397		65,790
Total		$	812,791	$	794,241

Segment assets for the Environmental Services, Oil Business, and Industrial & Field Services segments consist of property, plant, and equipment, right-of-use assets, intangible assets, accounts receivable, goodwill, and inventories. Assets for the corporate unallocated amounts consist of property, plant, and equipment used at the corporate headquarters as well as cash and net deferred tax assets.

(11) COMMITMENTS AND CONTINGENCIES

LEASES

Lessee

The Company leases buildings and property, railcars, machinery and equipment, and various types of vehicles and trailers for use in our operations. Each arrangement is evaluated individually to determine if the arrangement is or contains a lease at inception. The Company has lease agreements with lease and non-lease components and we have elected to not separate lease and non-lease components for all classes of underlying assets. In addition, our lease agreements do not contain any material residual guarantees or restrictive covenants.

Leases may include variable lease payments for common area maintenance, real estate taxes, and truck lease mileage. Variable lease payments are not included in the initial measurement of the right-of-use assets or lease liabilities, and are recorded as lease expense in the period incurred. Options to extend or terminate a lease are included in the lease term when it is reasonably certain that we will exercise that option. We have elected not to record leases with an initial term of 12 months or less on the balance sheet and instead recognize those lease payments on a straight-line basis over the lease term. Leases with initial terms in excess of 12 months are recorded as either operating or financing leases in our Consolidated Balance Sheet.

Right-of-use assets represent the Company's right to use an underlying asset during the lease term and lease liabilities represent the Company's obligation to make lease payments arising from the lease. Our leased right-of-use assets are measured at the initial measurement of the lease liability, adjusted for any lease payments made prior to the lease commencement date, less any lease incentives received and other initial direct costs incurred. Our lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. As most of our leases do not provide an implicit rate, we use an incremental borrowing rate based on the information available at commencement date, including lease term, in determining the present value of future payments.

Our leases have remaining terms ranging from less than one month to approximately 11 years and may include options to extend or terminate the lease when it is reasonably certain that the option will be exercised. Lease expense is recognized on a straight-line basis over the lease term. Our finance leases include a fleet of mobile equipment.

Lessor

The Company is a lessor of portions of buildings and property, and equipment such as embedded leases of parts cleaning machines. Each of the Company’s leases is classified as an operating lease, and the vast majority are short-term leases. Variable lease payments include real and personal property taxes, which are based on the lessee’s pro rata portion of such amounts, and excess mileage charges which are computed as the actual miles traveled in a calendar year minus the maximum average mileage allowance as specified per the contract. Options to extend the lease beyond the original terms range from day-to-day renewals to increments of five-year extensions. Options to terminate the lease range from immediate termination upon return of the asset to various written notification periods following a minimum lease term. Options for a lessee to purchase the underlying asset are not contractually specified but may be negotiated on a case-by-case basis. Significant judgments made in determining whether a contract contains a lease include assessments as to whether or not the contract conveys the right to direct the use of an identified asset. Significant judgments made in allocating consideration between lease and non-lease components include techniques applied in estimating the relative stand-alone selling prices of the lease and non-lease components of the contract in cases where a stand-alone selling price is not directly observable. No leased assets are covered by residual value guarantees. The Company manages the risk associated with the residual value of leased assets through such means as performing periodic maintenance and upkeep activities and the inclusion of contractual terms that hold the lessee responsible for damage incurred to leased assets. The Company has made an accounting policy election to exclude from the consideration in the contract, and from variable payments not included in the consideration in the contract, all taxes assessed by a governmental authority that are both imposed on and concurrent with a specific lease revenue-producing transaction and collected by the lessor from a lessee.

The Company recognizes rental income on a straight-line basis for that portion of the consideration allocated to the embedded lease component of certain of our parts cleaning contracts. We also recognize rental income on certain subleases of portions of buildings and property.

Rental income was as follows:


	Second Quarter Ended,
	June 30, 2023 (91 days)								June 18, 2022 (84 days)
(thousands)	Environmental Services		Oil Business		Industrial and Field Services		Total		Environmental Services		Oil Business		Industrial and Field Services		Total
Parts Cleaning	$	7,968	$	—	$	600	$	8,568	$	6,233	$	—	$	—	$	6,233
Property	104		11		—		115		32		9		—		41
Total rental income	$	8,072	$	11	$	600	$	8,683	$	6,265	$	9	$	—	$	6,274



	First Half Ended,
	June 30, 2023 (181 days)								June 18, 2022 (168 days)
(thousands)	Environmental Services		Oil Business		Industrial and Field Services		Total		Environmental Services		Oil Business		Industrial and Field Services		Total
Parts Cleaning	$	15,518	$	—	$	716	$	16,234	$	12,172	$	—	$	—	$	12,172

Property	121		17		—		138		56		23		—		79
Total rental income	$	15,639	$	17	$	716	$	16,372	$	12,228	$	23	$	—	$	12,251

Purchase Obligations

The Company may enter into purchase obligations with certain vendors. They represent expected payments to third party service providers and other commitments entered into during the normal course of our business. These purchase obligations are generally cancellable with or without notice, without penalty, although certain vendor agreements provide for cancellation fees or penalties depending on the terms of the contract.

The Company has purchase obligations in the form of open purchase orders of $21.3 million as of June 30, 2023, and $20.7 million as of December 31, 2022, primarily for used oil, solvent, machine purchases, disposal and transportation expenses, and capital expenditures.

Litigation and Claims

The Company may be subject to investigations, claims or lawsuits as a result of operating its business, including matters governed by environmental laws and regulations. The Company may also be subject to tax audits in a variety of jurisdictions. When claims are asserted, the Company evaluates the likelihood that a loss will occur and records a liability for those instances when the likelihood is deemed probable and the exposure is reasonably estimable. The Company carries insurance at levels it believes are adequate to cover loss contingencies based on historical claims activity. When the potential loss exposure is limited to the insurance deductible and the likelihood of loss is determined to be probable, the Company accrues for the amount of the required deductible, unless a lower amount of exposure is estimated. As of June 30, 2023 and December 31, 2022, the Company had accrued $3.1 million and $3.2 million related to loss contingencies and other contingent liabilities.

(12) INCOME TAXES

Income tax expense for the second fiscal quarter of 2023 was $3.3 million. The Company's effective income tax rate for the second quarter of fiscal 2023 was 27.7% compared to 27.0% in the second quarter of fiscal 2022. Tax expense for the first half of 2023 was $8.9 million. The Company’s effective income tax rate for the first half of 2023 was 26.1% compared to 26.4% in the first half of 2022. The rate decrease is principally attributable to the increased impact of certain favorable adjustments to financial reporting income due to decreased levels of profitability as compared to the first half of fiscal 2022.

The Company establishes reserves when it is more likely than not that the Company will not realize the full tax benefit of a position. The Company had a reserve of $2.2 million for uncertain tax positions as of June 30, 2023. The gross unrecognized tax benefits would, if recognized, decrease the Company's effective tax rate.

As of June 30, 2023, the Company believes it is more likely than not that a benefit from foreign net operating loss carryforwards will not be realized. The Company provided a valuation allowance against those foreign net operating loss carryforwards of $0.7 million.

(13) SHARE-BASED COMPENSATION

Restricted Stock Compensation/Awards

Annually, the Company grants restricted shares to its Board of Directors. The shares become fully vested one year from their grant date. The fair value of each restricted stock grant is based on the closing price of the Company's common stock on the date of grant. The Company amortizes the expense over the service period, which is the fiscal year in which the award is granted. In addition, the Company may grant restricted shares to certain members of management based on their services and contingent upon continued service with the Company. The restricted shares vest over a period of approximately three years from the grant date. The fair value of each restricted stock grant is based on the closing price of the Company's common stock on the date of grant.

On November 14, 2022, the Company granted 147,623 shares of restricted stock to certain members of Management as part of a Special Incentive Program. Up to 147,623 shares may vest on September 21, 2025. One-third of the shares vest in equal installments on each the first three anniversaries of September 21, 2022, subject to continuous employment or service with the Company through such date. Two-thirds of the shares are subject to the performance-based vesting terms based on the Company achieving certain Share Price Targets as set forth in the agreement during the three-year period beginning on September 21, 2022 (the “Performance Period”) and the Executive remaining employed by the Company through the Performance Period.

The following table shows a summary of restricted share grants and expense resulting from the awards:


			Compensation Expense
(thousands, except share amounts)			First Half Ended,				Unrecognized Expense as of,
Recipient of Grant	Grant Date	Restricted Shares	June 30, 2023 (181 days)		June 18, 2022 (168 days)		June 30, 2023 (181 days)		June 18, 2022 (168 days)
Special Incentive Grant	April, 2018	350,000	$	—	$	380	$	—	$	—
Members of Management	February, 2020	41,138	—		40		—		47
Members of Management	February, 2021	35,898	104		103		103		345
Chief Executive Officer	February, 2021	500,000	502		1,067		1,334		2,814
Members of Management	February, 2022	75,355	249		245		735		1,303
Members of Management	February, 2023	66,024	310		248		1,552		—
Board of Directors	April, 2022	17,082	—		234		—		246
Special Incentive Grant	November, 2022	147,623	524		—		2,339		—
Board of Directors	May, 2023	14,274	280		—		200		—

At June 30, 2023, there was $6.3 million of unrecognized stock-based compensation expense which is expected to be recognized over a weighted-average remaining vesting period of 1.7 years.

On January 8, 2021, the Company and Mr. Brian Recatto entered into an amended Executive Employment Agreement (the “Amended Agreement”) which was effective on February 1, 2021. Pursuant to the Amended Agreement, the Company replaced in its entirety section 4.3 of the First Amendment to the Executive Employment Agreement relating to equity compensation that was effective February 1, 2017. As of February 1, 2021, Mr. Recatto received a one-time award of 500,000 shares of restricted stock, subject to the achievement of performance criteria established by the Compensation Committee of the Board of Directors pursuant to the Company's 2019 Incentive Plan.

The award date for such Performance-Based Restricted Stock was on February 1, 2021. Such award was granted pursuant to and governed by the terms of the 2019 Incentive Plan and an award agreement in a form provided by the Company. The Performance-Based Restricted Stock one-time award of 500,000 shares received on February 1, 2021, shall vest on January 31, 2025 if Mr. Recatto is employed by the Company on that date, in an amount determined by applying the applicable percentages from the chart below, with the common stock price increases to be determined based on the increase in the price of the Company’s common stock (if any) from the closing price of the common stock as reported by Nasdaq on the amended agreement commencement date ($21.77) and the common stock price on the potential vesting date (determined by using the

average closing price of a share of the Company's common stock for the 90-day period ending on the vesting date). If the stock price does not increase by $5.00, then no shares shall vest.

During the second quarter of fiscal 2023, the Company recorded approximately $0.2 million of compensation expense related to this award. In the future, the Company expects to recognize compensation expense of approximately $1.3 million over the remaining requisite service period, which ends January 31, 2025. The fair value of this restricted stock award as of the grant date was estimated using a Monte Carlo simulation model. Key assumptions used in the Monte Carlo simulation to estimate the grant date fair value of this award are a risk-free rate of 0.29%, expected dividend yield of zero, and an expected volatility assumption of 53.07%.


Vesting Table
Increase in Stock Price From the Amended Agreement Commencement Date to the Vesting Date						Total Percentage of Restricted Stock Shares to Be Vested
Less than $5 per share increase						—%
$5 per share increase						25% (vest in 125,000 shares)
$10 per share increase						50% (vest in 250,000 shares)
$15 per share increase						75% (vest in 375,000 shares)
$20 or more per share increase						100% (vest in 500,000 shares)

Provision for possible accelerated vesting of award

If the average closing price of the Company's common stock increases by the marginal levels set forth in the above vesting table for any consecutive 180 day period between February 1, 2021 and January 31, 2025, Mr. Recatto shall become vested in 50% of the corresponding total percentage of restricted shares earned on the last day of the 180 day period.

In addition, on each of December 31, 2021, December 31, 2022, and December 31, 2023, to the extent Mr. Recatto remains employed by the Company under the Amended Agreement on such date, Mr. Recatto shall receive a grant of restricted stock as of such date valued at Five Hundred Thousand Dollars ($500,000), with the number of shares of restricted stock constituting such grant determined by applying the average closing price for a share of the Company’s common stock for the 90-day period ending on such date. Such awards of Time-Based Restricted Stock shall be granted pursuant to and governed by the terms of the 2019 Incentive Plan and an award agreement in a form provided by the Company. The Time-Based Restricted Stock shall vest only if Mr. Recatto remains employed by the Company under the Amended Agreement through December 31, 2023; provided, that, upon a Change of Control of the Company (as such term is defined in the Amended Agreement), all shares of the Time-Based Restricted Stock awarded up through the date of closing of the Change in Control shall become vested, and no further award of Time-Based Restricted Stock shall be awarded. During the second quarter of fiscal 2023, the Company recorded approximately $0.1 million of compensation expense related to this award.

The following table summarizes the restricted stock activity for the second quarter ended June 30, 2023:


Restricted Stock (Nonvested Shares)	Number of Shares	Weighted Average Grant-Date Fair Value Per Share
Nonvested shares outstanding at December 31, 2022	728,693	$	21.83
Granted	80,298	37.08
Vested	(99,487)	25.51
Forfeited	(28,797)	21.95
Nonvested shares outstanding at June 30, 2023	680,707	$	25.79

Employee Stock Purchase Plan

As of June 30, 2023, the Company had reserved 31,438 shares of common stock available for purchase under the Employee Stock Purchase Plan. In the second quarter of fiscal 2023, employees purchased 5,070 shares of the Company’s common stock with a weighted average fair market value of $35.24 per share.

(14) EARNINGS PER SHARE

The following table reconciles the number of shares outstanding for the second quarter of fiscal 2023 and 2022, respectively, to the number of weighted average basic shares outstanding and the number of weighted average diluted shares outstanding for the purposes of calculating basic and diluted earnings per share:


	Second Quarter Ended,				First Half Ended,
(thousands, except per share amounts)	June 30, 2023 (91 days)		June 18, 2022 (84 days)		June 30, 2023 (181 days)		June 18, 2022 (168 days)
Net income	$	8,642	$	21,107	$	25,231	$	33,985



Weighted average basic shares outstanding	23,681		23,489		23,665		23,482
Dilutive shares for share–based compensation plans	250		155		233		158
Weighted average diluted shares outstanding	23,931		23,644		23,898		23,640





Net income per share: basic	$	0.36	$	0.90	$	1.07	$	1.45
Net income per share: diluted	$	0.36	$	0.89	$	1.06	$	1.44

(15) FAIR VALUE MEASUREMENTS

Recurring Fair Value Measurements

The following tables summarize assets measured at fair value on a recurring basis (in millions) as of June 30, 2023:


	Quoted prices in active markets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)	Fair Value Measurements
Equity Securities (1)	$—	$—	$15.2	$15.2

(1) Represents a $3.0 million investment the Company made in its privately held battery recycling partner, HBR Retriev Holdco, LLC, a company controlled by the Heritage Group, an affiliate of the Company.

(16) SUBSEQUENT EVENTS

On July 19, 2023, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with JFL-Tiger Acquisition Co., Inc., a Delaware corporation (“Parent”), and JFL-Tiger Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of Parent (“Merger Sub”), pursuant to which, upon the terms and subject to the conditions set forth therein, Merger Sub will merge with and into the Company, with the Company surviving the merger as a wholly-owned subsidiary of Parent (the “Merger,” and together with the transactions contemplated by the Merger Agreement, the “Transaction”).

Pursuant to the Merger Agreement, at the effective time of the Merger (the “Effective Time”), each share of common stock of the Company then outstanding will be converted into the right to receive $45.50 in cash, without interest (the “Per Share Merger Consideration”), less any applicable withholding taxes, other than any shares as to which dissenters’ rights have been perfected (and not withdrawn or lost) in accordance with applicable law (which will be cancelled and converted into the right to receive a payment determined in accordance with Section 262 of the Delaware General Corporation Law).

The Merger Agreement also provides that immediately prior to the Effective Time, by virtue of the Merger and without any action on the part of the holder thereof (1) each outstanding Company restricted stock award will become fully vested and the restrictions with respect thereto will lapse, and all Company restricted stock awards will be treated in the Merger in the same manner as the other shares of Company Common Stock, and (2) each award of Company restricted stock units (“RSU”) that is outstanding immediately prior to the Effective Time will automatically be cancelled and converted into the right to receive a cash payment in an amount, without interest thereon and subject to applicable withholding taxes, equal to the product of (x) the

Per Share Merger Consideration and (y) the total number of shares of common stock of the Company subject to such award of RSUs as of immediately prior to the Effective Time.

The obligations of the parties to consummate the Merger are subject to the satisfaction or waiver of customary closing conditions set forth in the Merger Agreement, including, among other conditions, (1) the adoption of the Merger Agreement by the affirmative vote of the stockholders of the Company of not less than 75% of the issued and outstanding shares of common stock of the Company (the “Company Stockholder Approval”), (2) the expiration or termination of any waiting period applicable under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and (3) the absence of a “Company Material Adverse Effect” (as defined in the Merger Agreement) with respect to the Company.

Each of the Company, Parent and Merger Sub has made customary representations and warranties and covenants in the Merger Agreement, including covenants to use their respective reasonable best efforts to effect the Transaction, including securing regulatory approvals required by the Merger Agreement. In addition, the Company has agreed to other customary covenants, including, among others, covenants to conduct its business in the ordinary course during the interim period between the execution of the Merger Agreement and the closing of the Merger.

The Merger Agreement contains customary termination rights for each of Parent and the Company, including, among others, if (1) the Merger has not been consummated by February 29, 2024 (the “End Date”), (2) the requisite Company Stockholder Approval is not obtained, (3) there is any order or applicable law prohibiting or permanently enjoining the Transaction or (4) the other party breaches its covenants or representations and such breach is not cured within a specified period and would result in the failure of a closing condition in favor of the other party. In addition, the Company may terminate the Merger Agreement in order for the board of directors of the Company to cause or permit the Company to enter into an Alternative Acquisition Agreement with respect to a Superior Proposal, and Parent may terminate the Merger Agreement if the board of directors of the Company changes its recommendation in favor of the Transaction. The Merger Agreement further provides that, upon termination of the Merger Agreement under certain specified circumstances, the Company will be required to pay Parent a termination fee of $42,331,515 (except in the case the Merger Agreement is terminated in connection with a Superior Proposal during the Go-Shop Period, and certain other limited circumstances, in which case such termination fee will be $23,584,701), or Parent will be required to pay the Company a termination fee of $72,568,311 (the “Parent Termination Fee”).

The Merger is not subject to a financing condition. Parent has obtained (1) equity financing commitments from certain investment affiliates of J.F. Lehman & Company, LLC (“JFLCO”) and certain investment affiliates of HarbourVest Partners, and (2) debt financing commitments from certain third-party lenders, to fund the transactions contemplated by the Merger Agreement. The Merger Agreement requires Parent to use its reasonable best efforts to obtain the financing on the terms and conditions described in the financing commitments. The Company is entitled to specific performance, subject to the terms and conditions of the Merger Agreement and the applicable equity commitments, to force Parent to close the transaction if all closing conditions are met.

In addition, an investment affiliate of JFLCO has also provided a limited guarantee in favor of the Company (the “Limited Guarantee”) with respect to certain obligations of Parent and Merger Sub under the Merger Agreement, including a guarantee of payment of the Parent Termination Fee and certain other reimbursement obligations that may be owed by Parent pursuant to the Merger Agreement.

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Disclosure Regarding Forward-Looking Statements

You should read the following discussion in conjunction with our consolidated financial statements and related notes in our Annual Report on Form 10-K filed with the SEC on March 1,2023. In addition to historical information, this discussion contains forward-looking statements that involve risks, uncertainties and assumptions that could cause actual results to differ materially from our expectations. These statements can be identified by the fact that they do not relate strictly to historical or current facts. They use words such as "aim," "anticipate," "believe," "could," "estimate," "expect," "intend," "may," "plan," "project," "should," "will be," "will continue," "will likely result," "would" and other words and terms of similar meaning in conjunction with a discussion of future or estimated operating or financial performance. You should read statements that contain these words carefully, because they discuss our future expectations, contain projections of our future results of operations or of our financial position or state other “forward-looking” information. Forward-looking statements speak only as of the date of this quarterly report. Factors that could cause such differences include those described in the section titled “Risk Factors” and elsewhere in our Annual Report on Form 10-K for fiscal 2022 filed with the SEC on March 1, 2023. Except as required under federal securities laws and the rules and regulations of the SEC, we do not have any intention, and do not undertake, to update any forward-looking statements to reflect events or circumstances arising after the date of this quarterly report, whether as a result of new information, future events or otherwise. As a result of these risks and uncertainties, readers are cautioned not to place undue reliance on the forward-looking statements included in this quarterly report or that may be made elsewhere from time to time by, or on behalf of, us. All forward-looking statements attributable to us are expressly qualified by these cautionary statements. Certain tabular information may not foot due to rounding. Our fiscal year ends on December 31. Interim results are presented for the three months ("second quarter" or "quarter") ended June 30, 2023 and twelve weeks ("second quarter" or "quarter") ended June 18, 2022, respectively. "Fiscal 2022" represents the 52-week period ended December 31, 2022 and "Fiscal 2023" represents the twelve months ending on December 31, 2023.

Overview

As further detailed in Note 1 to our Financial Statements, beginning with our 2023 fiscal year, we changed our financial reporting cycle to a calendar year-end and end-of-month quarterly reporting cycle. Accordingly, our 2023 fiscal year began on January 1, 2023 (the day after the end of the 2022 fiscal year) and will end on December 31, 2023.

The table below shows the reporting periods as we refer to them in this report, their date ranges, and the number of days in each:

Reporting Period

Date Range

Number of Days

2023 second quarter

April 1, 2023 - June 30, 2023

2022 second quarter

March 27, 2022 - June 18, 2022

2023 first half

January 1, 2023 - June 30, 2023

181

2022 first half

January 2, 2022 - June 18, 2022

168

2023 fiscal year

January 1, 2023 - December 31, 2023

365

2022 fiscal year

January 2, 2022 - December 31, 2022

364

As a result of the change in our financial reporting cycle, our 2023 second quarter had 7 more calendar days than our 2022 second quarter. While our 2023 full fiscal year will have one additional day of activity as compared to our 2022 full fiscal year, our 2023 fourth quarter will have 20 fewer calendar days than the corresponding period in our 2022 fiscal year. The second quarter of 2023 includes 5 additional working days as a result of our fiscal quarter change. We estimate that the additional working days resulted in an increase in revenues of 7.8% in the second quarter of 2023 when compared to the second quarter of 2022. The first half of fiscal 2023 includes 9 additional working days as a result of our fiscal quarter change. We estimate that the additional working days resulted in an increase of revenues of 7.0% in the first half of fiscal 2023 when compared to the first half of fiscal 2022.

We provide full service parts cleaning, hazardous and non-hazardous bulk and containerized waste management, used oil collection, re-refining and lubricating base oil product sales, wastewater vacuum services, antifreeze collection, recycling and product sales, industrial and field services, and emergency and spill response services, and we own and operate a used oil re-refinery where we re-refine used lubricating oils into high quality lubricant base oil and other products. We believe that we are the second largest provider of full-service parts cleaning, hazardous and non-hazardous waste services and used oil collection

services to customers in both the industrial and vehicle maintenance sectors in North America. We also believe that we are the second largest used oil re-refiner by capacity in North America, and the second largest producer of remanufactured antifreeze in the United States. Our services help our customers manage their used chemicals and liquid and solid wastes, while also helping to minimize their regulatory burdens. We operate from a network of 105 branch and industrial service locations providing services to customers in 48 states and parts of Canada. We conduct business through three principal operating segments: Environmental Services, Oil Business, and Industrial and Field Services.

Our Environmental Services segment revenues are generated primarily from providing parts cleaning, containerized waste management and wastewater vacuum services as well as selling remanufactured antifreeze products. Revenues from this segment accounted for approximately 49.9% of our total Company revenues for the second quarter of fiscal 2023. In the Environmental Services segment, we define and measure same-branch revenues for a given period as the subset of all our branches that have been open and operating throughout and between the periods being compared, and we refer to these as established branches. We calculate average revenues per working day by dividing our revenues by the number of non-holiday weekdays in the applicable fiscal year or fiscal quarter.

Our Oil Business segment consists primarily of our used oil collection and used oil re-refining activities, along with our recycled fuel oil ("RFO") sales which together accounted for approximately 25.6% of our total Company revenues in the second quarter of fiscal 2023.

Our Industrial and Field Services segment revenues are generated mainly from providing industrial and field services, emergency and spill response services and non-hazardous waste processing and disposal services. Revenue generated in this segment accounted for approximately 24.5% of our total Company revenues in the second quarter of fiscal 2023.

We have established prices for our services primarily based on the perceived value of those services in the marketplace. Our customer agreements typically provide for annual renewal and price increases. With respect to our oil product sales, some prices are set through contracts or purchase orders with customers, which may be based on the market prices of an underlying commodity or market indicator.

Our operating costs include the costs of obtaining the materials we use in our products and services, such as used oil collected from customers or purchased from third party collectors, solvent, and other chemicals. The used solvent that we retrieve from customers in our product reuse program is accounted for as a reduction in our net cost of solvent under operating costs, whether placed in inventory or sold to a purchaser for reuse. Changes in the price of crude oil can impact operating costs indirectly as it may impact the price we pay for solvent or used oil, although we attempt to offset volatility in the oil markets by managing the spread between the costs we incur to obtain our materials and the prices we charge for our products and services. Operating costs also include transportation of solvents and waste, payments to third parties to recycle or dispose of the waste materials that we collect, and the costs of operating our re-refinery, recycling centers, non-hazardous waste processing facilities, hubs, and branch system including personnel costs (including commissions), facility rent, truck leases, fuel, and maintenance. Our operating costs as a percentage of revenues generally increase in relation to the number of new branch openings. As new branches achieve route density and scale efficiencies, our operating costs as a percentage of revenues generally decrease.

We use profit before corporate selling, general, and administrative expenses ("SG&A") as a key measure of segment profitability. We define profit before corporate SG&A expense as revenue less operating costs and depreciation and amortization from operations.

Our corporate selling, general, and administrative expenses include the costs of performing centralized business functions, including sales management at or above the regional level, business management and marketing, billing, receivables management, accounting and finance, internal audit, logistics management beyond the branch level, environmental health and safety, human resources, and legal.

We operate a used oil re-refinery located in Indianapolis, Indiana, through which we recycle used oil into high quality lubricant base oil and other products. We supply the base oil to firms that produce and market finished lubricants. Our re-refinery has an annual nameplate capacity of approximately 75 million gallons of used oil feedstock, allowing it to produce approximately 50 million gallons of lubricating base oil per year when operating at full capacity.

Critical Accounting Policies

Critical accounting policies are those that are both important to the accurate portrayal of a company’s financial condition and results and require subjective or complex judgments, often as a result of the need to make estimates about the effect of matters that are inherently uncertain.

In order to prepare financial statements that conform to accounting principles generally accepted in the United States, commonly referred to as GAAP, we make estimates and assumptions that affect the amounts reported in our financial statements and accompanying notes. Certain estimates are particularly sensitive due to their significance to the financial statements and the possibility that future events may be significantly different from our expectations.

There were no material changes during the second quarter of fiscal 2023 to the information provided under the heading "Critical Accounting Policies" included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2022 except for the fiscal year change as further described in Note 1.

RESULTS OF OPERATIONS

General

The following table sets forth certain operating data as a percentage of revenues for the periods indicated:


		For the Second Quarter Ended,								First Half Ended,
(thousands)		June 30, 2023 (91 days)				June 18, 2022 (84 days)				June 30, 2023 (181 days)				June 18, 2022 (168 days)

Revenues
Service revenues		$	121,342	63.1	%	$	75,584	48.3	%	$	240,794	62.4	%	$	144,500	48.8	%
Product revenues		62,141		32.3	%	74,789		47.7	%	128,481		33.3	%	139,262		47.0	%
Rental income		8,683		4.5	%	6,274		4.0	%	16,372		4.2	%	12,251		4.1	%
Total revenues		$	192,166	100.0	%	$	156,647	100.0	%	$	385,647	100.0	%	$	296,013	100.0	%
Operating expenses
Operating costs		$	146,387	76.2	%	$	104,755	66.9	%	$	286,448	74.3	%	$	206,538	69.8	%
Selling, general, and administrative expenses	*	20,361		10.6	%	15,024		9.6	%	38,061		9.9	%	28,759		9.7	%
Depreciation and amortization		11,802		6.1	%	6,777		4.3	%	23,969		6.2	%	13,285		4.5	%
Other (income) expense - net		(265)		(0.1)	%	1,001		0.6	%	(734)		(0.2)	%	791		0.3	%
Operating income		13,881		7.2	%	29,090		18.6	%	37,903		9.8	%	46,640		15.8	%
Interest expense – net		1,929		1.0	%	250		0.2	%	3,743		1.0	%	473		0.2	%
Income before income taxes		11,952		6.2	%	28,840		18.4	%	34,160		8.9	%	46,167		15.6	%
Provision for income taxes		3,310		1.7	%	7,733		4.9	%	8,929		2.3	%	12,182		4.1	%
Net income		$	8,642	4.5	%	$	21,107	13.5	%	$	25,231	6.5	%	$	33,985	11.5	%

*Does not include depreciation and amortization related to corporate selling, general, and administrative activity.

Revenues

Revenue for the second quarter of 2023 was $192.2 million compared to $156.6 million for the same quarter of 2022, an increase of $35.5 million, or 22.7%. The $35.5 million increase in revenue was mainly driven by revenue from the Patriot acquisition made during the second half of 2022 as well as higher demand and increased prices for our products and services in our Environmental and Industrial & Field Segments partially offset by the decrease in base oil sales price. For the first half of fiscal 2023, revenues increased $89.6 million, or 30.3%, from $296.0 million in the first half of fiscal 2022 to $385.6 million in the first half of 2023 mainly driven by the above mentioned factors. The second quarter of 2023 includes 5 additional working days as a result of our fiscal quarter change. We estimate that the additional working days resulted in an increase in revenues of 7.8% in the second quarter of 2023 when compared to the second quarter of 2022. The first half of fiscal 2023 includes 9 additional working days as a result of our fiscal quarter change. We estimate that the additional working days resulted in an increase of revenues of 7.0% in the first half of fiscal 2023 when compared to the first half of fiscal 2022.

Operating costs

Operating costs as a percentage of revenue increased to 76.2% during the second quarter of 2023 compared to 66.9% in the second quarter of 2022. The increase is mainly due to the decrease in base oil selling price that resulted in decreased oil revenues without an equal corresponding decrease in cost of goods sold, and also due to higher labor and related benefits, disposal costs, as well as transportation related expenses as a result of the Patriot acquisition made during the second half of 2022. Operating costs increased $79.9 million, or 38.7%, in the first half of fiscal 2023 compared to the first half of fiscal 2022 mainly due to the above mentioned factors.

We expect that in the future our operating costs in the Environmental Services, Oil Business, and Industrial & Field Services segments may increase or decrease depending on our product and service volumes and changes in commodity pricing, along with other factors.

Selling, general, and administrative expenses

Selling, general, and administrative expenses as a percentage of revenue increased to 10.6% during the second quarter of 2023 compared to 9.6% in the second quarter of 2022. The increase is mainly due to higher salaries and benefits as well as higher depreciation and amortization costs as a result of the Patriot acquisition made during the second half of 2022. Selling, general, and administrative expenses increased $9.3 million, or 32.3%, from the first half of fiscal 2022 to the first half of fiscal 2023 mainly due to the above mentioned factors as well as due to the additional 5 working days in the first half of 2023 compared to the first half of 2022.

Interest expense - net

Interest expense - net for the second quarter of fiscal 2023 and fiscal 2022 was $1.9 million and $0.3 million, respectively. The increase in interest expense is due to higher borrowings during the second quarter of 2023 compared to the second quarter of 2022. Interest expense - net for the first half of fiscal 2023 and 2022 was $3.7 million and $0.5 million respectively. The increase in interest expense during the first half of 2023 is mainly due to the above mentioned factors.

Provision for income taxes

The Company's effective income tax rate for the second quarter of fiscal 2023 was 27.7% compared to 27.0% in the second quarter of fiscal 2022. The Company’s effective income tax rate for the first half of fiscal 2023 was 26.1% compared to 26.4% in the first half of 2022. The rate decrease is principally attributable to the increased impact of certain favorable adjustments to financial reporting income due to decreased levels of profitability as compared to the first half of fiscal 2022.

Segment Information

As further described in Note 10, prior period segment results presented for comparative purposes below have been recast to reflect the newly reportable segment as a separate segment. The following table presents revenues by reportable segment:


		Second Quarter Ended,				Change
(thousands)		June 30, 2023 (91 days)		June 18, 2022 (84 days)		$		%
Revenues:
	Environmental Services	$	95,965	$	78,175	$	17,790	22.8	%
	Oil Business	$	49,132	$	64,769	$	(15,637)	(24.1)	%
	Industrial & Field Services	$	47,069	$	13,703	$	33,366	243.5	%
	Total	$	192,166	$	156,647	$	35,519	22.7	%


	First Half Ended,				Change
(thousands)	June 30, 2023 (181 days)		June 18, 2022 (168 days)		$		%
Revenues:
Environmental Services	$	190,732	$	151,720	$	39,012	25.7	%
Oil Business	102,088		119,484		(17,396)		(14.6)	%
Industrial & Field Services	92,827		24,809		68,018		274.2	%
Total	$	385,647	$	296,013	$	89,634	30.3	%

In the second quarter of fiscal 2023, Environmental Services revenue was $96.0 million compared to $78.2 million during the second quarter of fiscal 2022. The 22.8% increase in revenue was mainly due to the continued increase in demand and higher prices for our services compared to the prior year quarter. We experienced revenue increases across all service lines in the segment when compared to the second quarter of 2022. For the first half of fiscal 2023, Environmental Services revenue was $190.7 million, compared to $151.7 million during the first half of fiscal 2022. The 25.7% increase in revenue was mainly due to the above mentioned factors. The second quarter of 2023 includes 5 additional working days as a result of our fiscal quarter change. We estimate that the additional working days resulted in an increase in revenues of 7.8% in the second quarter of 2023 when compared to the second quarter of 2022. We estimate that the additional working days resulted in an increase in revenues of 7.0% in the first half of fiscal 2023 when compared to the first half fiscal 2022.

During the second quarter of fiscal 2023, Oil Business revenue was $49.1 million compared to $64.8 million in the second quarter of fiscal 2022, a decrease of $15.6 million or 24.1%. A decrease in base oil sales volume due to lower demand and base oil sales price were the main drivers of the decrease in revenue compared to the prior year quarter. For the first half of fiscal 2023, Oil Business revenues were $102.1 million, compared to $119.5 million during the first half of fiscal 2022. The decrease in revenue was driven primarily by the above mentioned factors. Additionally, the second quarter of 2023 includes 5 additional working days as a result of our fiscal quarter change. We estimate that the additional working days would have resulted in an increase in revenues of 7.8% in the second quarter of 2023 when compared to the second quarter of 2022 if sales volume and pricing were unchanged year-over-year. We estimate that the additional working days would have resulted in an increase in revenues of 7.0% in the first half of fiscal 2023 when compared to the first half fiscal 2022, if sales volume and pricing were unchanged year-over-year.

Industrial & Field Services revenue was $47.1 million for the second quarter of fiscal 2023 compared to $13.7 million for the second quarter of fiscal 2022. The $33.4 million increase in revenue was mainly driven by revenue from the Patriot acquisition made during the second half of 2022 and, to a lesser extent, by higher demand and increased prices for our services. Industrial & Field Services revenues were $92.8 million, compared to $24.8 million during the first half of fiscal 2022. The increase in revenue was driven primarily by the above mentioned factors. Additionally, the second quarter of 2023 includes 5 additional working days as a result of our fiscal quarter change. We estimate that the additional working days resulted in an increase in revenues of 7.8% in the second quarter of 2023 when compared to the second quarter of 2022. We estimate that the additional working days resulted in an increase in revenues of 7.0% in the first half of fiscal 2023 when compared to the first half fiscal 2022.

Segment Profit Before Corporate Selling, General and Administrative Expenses ("SG&A")

The following table presents profit by reportable segment before corporate SG&A expense:


		Second Quarter Ended,				Change
(thousands)		June 30, 2023 (91 days)		June 18, 2022 (84 days)		$		%
Profit before corporate SG&A*
	Environmental Services	$	23,865	$	18,594	$	5,271	28.3%
	Oil Business	5,676		26,803		(21,127)		(78.8)%
	Industrial & Field Services	$	7,524	$	1,178	$	6,346	538.7%
	Total	$	37,065	$	46,575	$	(9,510)	(20.4)%


		First Half Ended,				Change
(thousands)		June 30, 2023 (181 days)		June 18, 2022 (168 days)		$		%
Profit before corporate SG&A*
	Environmental Services	$	46,593	$	31,647	$	14,946	47.2%
	Oil Business	19,729		45,269		(25,540)		(56.4)%
	Industrial & Field Services	$	14,981	$	2,269	$	12,712	560.2%
	Total	$	81,303	$	79,185	$	2,118	2.7%

*Includes depreciation and amortization related to operating activity but not depreciation and amortization related to corporate selling, general, and administrative activity. For further discussion see Note 10 in our consolidated financial statements included elsewhere in this document.

Environmental Services profit before corporate SG&A expense increased $5.3 million, or 28.3%, in the second quarter of fiscal 2023 compared to the second quarter of fiscal 2022. Operating margin for second quarter of 2023 was 24.9% compared to the recast margin of 23.8% in the second quarter of 2022. The increase in operating margin was mainly driven by increased revenues in comparison with the increase in our labor and transportation expenses.

Environmental Services profit before corporate SG&A expense increased $14.9 million, or 47.2%, in the first half of fiscal 2023 compared to the first half of fiscal 2022. Operating margin for first half of fiscal 2023 was 24.4% compared to 20.9% in the first half of fiscal 2022. The increase in operating margin was mainly driven by increased revenues in comparison with the increase in our labor and transportation expenses.

Oil Business profit before corporate SG&A expense decreased $21.1 million, or 78.8%, in the second quarter of fiscal 2023 compared to the second quarter of fiscal 2022. Oil Business segment operating margin decreased to 11.6% in the second quarter of 2023 compared to 41.4% in the second quarter of fiscal 2022. The lower operating margin compared to the second quarter of 2022 was mainly due to a decrease in revenue along with increased transportation expenses, labor costs and higher cost of goods sold.

Oil Business profit before corporate SG&A expense decreased $25.5 million or 56.4% in the first half of fiscal 2023 compared to the first half of fiscal 2022. The factors which drove the decrease during the first half of fiscal 2023 compared to the first half of fiscal 2022 were mainly due to a decrease in revenue along with higher transportation expenses and labor costs.

Industrial & Field Services profit before corporate SG&A expense increased $6.3 million, or 538.7%, in the second quarter of fiscal 2023 compared to the second quarter of fiscal 2022. Operating margin for second quarter of 2023 was 16.1% compared to the recast margin of 8.6% in the second quarter of 2022. The increase in operating margin was mainly driven by increased revenues in comparison with the increased in operating costs as a result of the Patriot acquisition made during the second half of 2022.

Industrial & Field Services profit before corporate SG&A expense increased $12.7 million or 560.2% in the first half of fiscal 2023 compared to the first half of fiscal 2022. Operating margin for the first half of fiscal 2023 was 16.1% compared to the recast margin of 9.1% in the first half of fiscal 2022. The increase in operating margin was mainly driven by increased revenues in comparison with the increased in operating costs as a result of the Patriot acquisition made during the second half of 2022.

FINANCIAL CONDITION

Liquidity and Capital Resources

Cash and Cash Equivalents

As of June 30, 2023 and December 31, 2022, cash and cash equivalents were $33.1 million and $22.1 million, respectively. Our primary sources of liquidity are cash flows from operations and funds available to borrow under our revolving bank credit facility.

Debt and Financing Arrangements

The Company's weighted average interest rate for all debt for the second quarter ended June 30, 2023 was 6.6%.

•An interest coverage ratio (based on interest expense and EBITDA) of at least 3.5 to 1.0;

The Credit Agreement places certain limitations on acquisitions and the payment of dividends.

As of June 30, 2023 and December 31, 2022, the Company was in compliance with all covenants under its Credit Agreement. As of June 30, 2023 and December 31, 2022, the Company, had $6.0 million of standby letters of credit issued, and $59.0 million and $54.0 million was available for borrowing under the bank credit facility, respectively.

We believe that our existing cash, cash equivalents, available borrowings, and other sources of financings will be sufficient to meet our anticipated cash needs for working capital and capital expenditures for at least the next 12 months. We cannot assure you that this will be the case or that our assumptions regarding revenues and expenses underlying this belief will be accurate. If, in the future, we require more liquidity than is available to us under our credit facility, we may need to raise additional funds through debt or equity offerings. Adequate funds may not be available when needed or may not be available on terms favorable to us. If additional funds are raised by issuing equity securities, dilution to existing stockholders may result. If

we raise additional funds by obtaining loans from third parties, the terms of those financing arrangements may include negative covenants or other restrictions on our business that could impair our operational flexibility, and would also require us to fund additional interest expense. If funding is insufficient at any time in the future, we may be unable to develop or enhance our products or services, take advantage of business opportunities, or respond to competitive pressures, any of which could have a material adverse effect on our business, financial condition and results of operations.

Summary of Cash Flow Activity


	First Half Ended,
(thousands)	June 30, 2023 (181 days)		June 18, 2022 (168 days)
Net cash provided by (used in):
Operating activities	$	46,839	$	39,168
Investing activities	(25,321)		(18,840)
Financing activities	(10,471)		(2,837)
Net increase in cash and cash equivalents	$	11,047	$	17,491

The most significant items affecting the comparison of our operating activities for the second quarter of fiscal 2023 and the second quarter of fiscal 2022 are summarized below:

Net Cash Provided by Operating Activities —

•Earnings — Our decrease in net income during the first half of 2023 unfavorably impacted our net cash provided by operating activities by $8.8 million compared to the first half of 2022.

•Accounts Receivable — The decrease in accounts receivable during the first half of 2023 had a favorable impact on cash provided by operating activities of $26.6 million compared to the increase in accounts receivable during the first half of fiscal 2022. The favorable decrease in accounts receivable is as a result of lower base oil sales price and increased collection efforts.

•Accounts Payable — The decrease in accounts payable had an unfavorable impact on cash provided by operating activities of $11.6 million in the first half of fiscal 2023. The decrease in accounts payable was partially due to intentionally prepaying invoices in June 2023 due to a pending ERP system conversion that went live on July 1, 2023.

Net Cash Used in Investing Activities —

•Capital expenditures — We made capital expenditures as follows:


	First Half Ended,
(millions)	June 30, 2023 (181 days)		June 18, 2022 (168 days)
Facility purchases, construction, and improvements	$	15.1	$	3.1
Parts cleaning machines	6.1		2.9
Trucks and trailers	3.4		2.9
Re-refinery capital improvements	1.8		4.1
IT and other corporate projects	0.5		2.9

Total	$	26.9	$	15.9

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are exposed to interest rate risks primarily through borrowings under our bank credit facility. Interest on this facility is based upon variable interest rates. Our weighted average borrowings under our bank credit facility during the second quarter of fiscal 2023 was $85.3 million, and the annual effective interest rate during the second quarter of fiscal 2023 was 6.6%. We currently do not hedge against interest rate risk. Based on the foregoing, a hypothetical 1.0% increase or decrease in interest rates would have resulted in a $0.2 million change to our interest expense in the second quarter of fiscal 2023.

ITEM 4. CONTROLS AND PROCEDURES

The Company's Chief Executive Officer and Chief Financial Officer have concluded, based on their evaluation as of the end of the period covered by this report, that the Company's disclosure controls and procedures (as defined in the Securities Exchange Act of 1934 Rules 13a-15(e) and 15d-15(e)) are effective to ensure that information required to be disclosed in the reports that the Company files or submits under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial

Officer, as appropriate, to allow timely decisions regarding financial disclosures.

Changes in Internal Control Over Financial Reporting

There have been no changes in the Company’s internal controls over financial reporting during the second quarter ended June 30, 2023 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

PART II

ITEM 1. LEGAL PROCEEDINGS

There were no material developments during the second quarter of fiscal 2023 with respect to the legal proceedings previously disclosed in our Annual Report on Form 10-K for the fiscal year ended December 31, 2022.

ITEM 1A. RISK FACTORS

Reference is made to the factors set forth under the caption “Disclosure Regarding Forward-Looking Statements” in Part I, Item 2 of this quarterly report on Form 10-Q and other risk factors described in our annual report on Form 10-K for fiscal 2022 filed with the SEC on March 1, 2023, which are incorporated herein by reference. There have not been any material changes to the risk factors previously disclosed in our annual report on Form 10-K for fiscal 2022, except as set forth below.

The Merger, the pendency of the Merger or our failure to consummate the Merger could have a material adverse effect on our business, results of operations, financial condition and the price of our common stock.

We have entered into the Merger Agreement pursuant to which we have agreed to merge with an affiliate of J.F. Lehman & Company (“Parent”). The completion of the Merger is subject to certain closing conditions, including approval of the Merger Agreement by our stockholders, receipt of regulatory approvals and such other conditions to completion as set forth in the Merger Agreement. There is no assurance that all of the various conditions will be satisfied, or that the Merger will be completed on the proposed terms, within the expected timeframe, or at all. Our ongoing business may be materially adversely affected by the announcement or the pendency of the Merger, and we would be subject to a number of risks, including the following:

•we may experience negative publicity, which could have an adverse effect on our ongoing operations including, but not limited to, retaining and attracting employees and maintaining our relationships with existing customers and obtaining potential new customers;

•we will be required to pay certain significant costs relating to the Merger, regardless of if the Merger is consummated, such as for example legal, accounting, financial advisory, regulatory, printing and other professional services fees, which may relate to activities that we would not have undertaken other than in connection with the Merger;

•except during the go shop period contemplated by the Merger Agreement, we are unable to solicit other acquisition proposals during the pendency of the Merger;

•while the Merger Agreement is in effect, we are subject to restrictions on our business activities, including, among other things, restrictions on our ability to engage in certain kinds of material transactions, or incurring certain indebtedness, which could prevent us from pursuing strategic business opportunities, taking actions with respect to the business that we may consider advantageous and responding effectively and/or timely to competitive pressures and industry developments, and may as a result materially adversely affect our business, results of operations and financial condition;

•matters relating to the Merger require substantial commitments of time and resources by our management, which could result in the distraction of management from ongoing business operations and pursuing other opportunities that could have been beneficial to us; and

•we may commit significant time and resources to defending against litigation (from our stockholders or otherwise) related to the Merger.

If the Merger is not consummated, the risks described above may materialize or be worsened, and they may have a material adverse effect on our business, results of operations, financial condition and the price of our common stock, particularly to the extent that the current market price of our common stock reflects an assumption that the Merger will be completed. If the Merger is not consummated, investor confidence could decline, stockholder litigation could be brought against us, our directors and/or officers, relationships with existing and prospective customers, service providers, investors, lenders and other business partners may be adversely impacted, we may be unable to attract or retain key personnel, our employees could be distracted and their productivity decline and profitability may be adversely impacted due to costs incurred in connection with the pending Merger. We may experience negative reactions from the financial markets, including negative impacts on our stock price, and it is uncertain when, if ever, the price of our shares would return to the prices at which our shares traded prior to the failure of the proposed Merger. If the Merger is not consummated, including as a result of our stockholders failing to approve the Merger, our stockholders will not receive any payment for their shares of our common stock in connection with the Merger. Instead, we will remain a public company, our common stock will continue to be listed and traded on The Nasdaq Stock Market and registered

under the Securities Exchange Act of 1934, as amended, and we will be required to continue to file periodic reports with the SEC.

Even if successfully completed, there are certain risks to our stockholders from the Merger, including:

•the amount of cash to be paid per share under the Merger Agreement is fixed and will not be adjusted for changes in our business, assets, liabilities, prospects, outlook, financial condition or operating results or in the event of any change in the market price of, analyst estimates of, or projections relating to, our common stock;

•the fact that receipt of the all-cash per share consideration under the Merger Agreement is taxable to stockholders that are treated as U.S. holders for U.S. federal income tax purposes; and

•the fact that, if the Merger is completed, our stockholders will not participate in any future growth potential or benefit from any future increase in the value of the Company.

The proposed Merger is subject to approval of our stockholders as well as the satisfaction of other closing conditions, including government consents and approvals, some or all of which may not be satisfied or completed within the expected timeframe, or at all.

The proposed Merger may not be completed within the expected timeframe, or at all, as a result of various factors and conditions, some of which are beyond our control. Completion of the Merger is subject to a number of closing conditions, including, among others, (i) the adoption of the Merger Agreement by the affirmative vote of the stockholders of the Company of not less than 75% of the issued and outstanding shares of Company common stock, (ii) the expiration or termination of any waiting period applicable under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and (iii) the absence of a “Company Material Adverse Effect” (as defined in the Merger Agreement) with respect to the Company. We can provide no assurance that all required consents and approvals will be obtained or that all closing conditions will otherwise be satisfied (or waived, if applicable), and, even if all required consents and approvals can be obtained and all closing conditions are satisfied (or waived, if applicable), we can provide no assurance as to the terms, conditions and timing of such consents and approvals or the timing of the completion of the Merger. Many of the conditions to completion of the Merger are not within our control, and we cannot predict when or if these conditions will be satisfied (or waived, if applicable). Other developments beyond our control, including, but not limited to, changes in domestic or global economic, political or industry conditions may affect the timing or success of the Merger. Additionally, under circumstances specified in the Merger Agreement, we or Parent may terminate the Merger Agreement. Any adverse consequence of the pending Merger could be exacerbated by any delays in completion of the Merger or by the termination of the Merger Agreement.

The obligation of each party to the Merger Agreement to consummate the Merger is also subject to the accuracy of the representations and warranties of the other party (subject to customary materiality qualifications) and compliance in all material respects with the covenants and agreements contained in the Merger Agreement as of the closing of the Merger, including, with respect to us, covenants to conduct our business in the ordinary course and to not engage in certain kinds of material transactions prior to closing of the Merger. In addition, the Merger Agreement may be terminated under certain specified circumstances, including, but not limited to, in connection with a change in the recommendation of our Board of Directors to enter into an agreement for a Superior Proposal (as defined in the Merger Agreement). As a result, we cannot assure you that the Merger will be completed, even if our stockholders approve the Merger, or that, if completed, it will be exactly on the terms set forth in the Merger Agreement or within the expected timeframe.

We will be subject to various uncertainties while the Merger is pending that may cause disruption and may make it more difficult to maintain relationships with our employees and third-party business partners.

Our efforts to complete the Merger could cause substantial disruptions in, and create uncertainty surrounding, our business, which may materially adversely affect our business, results of operations and financial condition. Uncertainty as to whether the Merger will be completed may affect our ability to recruit prospective employees or to retain and motivate existing employees. Employee retention may be particularly challenging while the Merger is pending because employees may experience uncertainty about their roles following the Merger. A substantial amount of our management’s and employees’ attention will be directed toward the completion of the Merger and thus be diverted from our day-to-day operations.

Uncertainty as to the future could adversely affect our business and our relationship with third parties. For example, certain of our customers may decide not to work with us anymore as a result of the proposed Merger, which could result in a permanent loss of such customers even if the Merger is not consummated. Changes to or termination of existing business relationships could adversely affect our revenue, earnings and financial condition, as well as the market price of our common stock. The adverse effects of the pendency of the Merger could be exacerbated by any delays in completion of the Merger or by the termination of the Merger Agreement.

While the Merger is pending and the Merger Agreement is in effect, we are subject to restrictions on our business activities.

While the Merger is pending and the Merger Agreement is in effect, we are generally required to conduct our business in the ordinary course. Pursuant to the terms of the Merger Agreement, we are restricted from taking certain specified actions without Parent’s prior consent, which is not to be unreasonably withheld, conditioned or delayed. These limitations including, among other things, certain restrictions on our ability to amend our organizational documents; acquire other businesses and assets; make certain investments; repurchase, reclassify or issue securities; make loans; pay dividends; incur indebtedness; enter into certain contracts; change accounting policies or procedures; settle certain litigation; change tax classifications and elections; or take certain actions relating to intellectual property of the Company. These restrictions could prevent us from pursuing strategic business opportunities and taking actions with respect to our business that we may consider advantageous and may, as a result, materially and adversely affect our business, results of operations and financial condition. Adverse effects arising from these restrictions during the pendency of the Merger could be exacerbated by any delays in consummation of the Merger or termination of the Merger Agreement.

The Merger Agreement limits our ability to pursue alternatives to the Merger and may discourage other companies from trying to acquire us for greater consideration than what Parent has agreed to pay.

The Merger Agreement contains provisions that make it more difficult for us to sell our business to a company other than Parent. These provisions include a general prohibition on us soliciting any acquisition proposal or offer for a competing transaction following the conclusion of the “go-shop” period provided for in the Merger Agreement, which will conclude at 11:59 p.m. Eastern time on August 23, 2023. If we terminate the Merger Agreement in connection with our Board of Directors’ authorization for us to enter into a definitive agreement to consummate an alternative transaction contemplated by a superior proposal, we will be required to pay a termination fee of $23,584,701. We may also be required to pay the $23.6 million termination fee if we or Parent terminate the Merger Agreement under certain other circumstances specified in the Merger Agreement.

These provisions might discourage a third party that has an interest in acquiring all or a significant part of the Company from considering or proposing an acquisition, even if the party were prepared to pay consideration with a higher per share cash or market value than the cash value proposed to be received in the Merger, or might result in a potential competing acquirer proposing to pay a lower price than it might otherwise have proposed to pay because of the added expense of the termination fee that may become payable in certain circumstances.

In certain instances, the Merger Agreement requires us to pay a termination fee to Parent, which could affect the decisions of a third party considering making an alternative acquisition proposal.

In certain specified circumstances further described in the Merger Agreement, in connection with the termination of the Merger Agreement, we will be required to pay Parent a termination fee of $42.3 million, except in the case the Merger Agreement is terminated in connection with a Superior Proposal during the go-shop period, and certain other limited circumstances, in which case such termination fee will be $23.6 million (the “Company Termination Payment”), including if Parent terminates the Merger Agreement after the Company Board changes its recommendation to the stockholders or if the Company terminates the Merger Agreement to enter into an alternative acquisition agreement with respect to a Superior Proposal. This payment could affect the structure, pricing and terms proposed by a third party seeking to acquire or merge with us and could discourage a third party from making a competing acquisition proposal or inquiry, including a proposal that would be more favorable to our stockholders than the Merger. For these and other reasons, termination of the Merger Agreement could materially and adversely affect our business, results of operations and financial condition, which in turn could materially and adversely affect the price of our common stock.

We may be the target of securities class action and derivative lawsuits and other legal or regulatory proceedings, which could result in substantial costs and may delay or prevent the Merger from being completed.

Securities class action lawsuits and derivative lawsuits are often brought against public companies that have entered into merger agreements. Even if such lawsuits or other legal or regulatory proceedings are without merit, defending against these claims can result in substantial costs and divert management time and resources. An adverse judgment in any such lawsuits or proceedings could result in monetary damages payable by the Company, which could have a negative impact on our liquidity, results of operations and financial condition. Additionally, if a plaintiff is successful in obtaining an injunction prohibiting completion of the proposed Merger, then that injunction may delay or prevent the proposed Merger from being completed, which may exacerbate the other risks described herein and adversely affect our business, results of operation and financial condition.

ITEM 6. EXHIBITS



31.1			Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2			Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1			Certification of Chief Executive Officer pursuant to 18 U.S. Code Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2			Certification of Chief Financial Officer pursuant to 18 U.S. Code Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
99.1			Form 8-K of the Company filed on July 18, 2023 Merger Announcement
101.INS*			XBRL Instance Document
101.SCH*			XBRL Taxonomy Extension Schema Document
101.CAL*			XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB*			XBRL Taxonomy Extension Label Linkbase Document
101.PRE*			XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF*			XBRL Taxonomy Extension Definition Linkbase Document

*In accordance with Regulation S-T, the XBRL-related information in Exhibits 101 to this Quarterly Report on Form 10-Q shall be deemed to be "furnished" and not "filed."

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

HERITAGE-CRYSTAL CLEAN, INC.


Date:	August 9, 2023	By:	/s/ Mark DeVita

			Mark DeVita
			Executive Vice President & Chief Financial Officer

EXHIBIT 31.1

CERTIFICATION OF PRESIDENT AND CEO — PRINCIPAL EXECUTIVE OFFICER

PURSUANT TO RULES 13a-14(A) AND 15d-14(A)

OF THE SECURITIES EXCHANGE ACT OF 1934

I, Brian Recatto, certify that:

1.I have reviewed this report on Form 10-Q of Heritage-Crystal Clean, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.


Date: August 9, 2023			By: /s/ Brian Recatto

			Brian Recatto
			President, CEO and Director — Principal Executive Officer

EXHIBIT 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO RULES 13a-14(A) AND 15d-14(A)

OF THE SECURITIES EXCHANGE ACT OF 1934

I, Mark DeVita, certify that:

1.I have reviewed this report on Form 10-Q for Heritage-Crystal Clean, Inc.;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, and cash flows of the registrant as of, and for, the periods presented in this report;

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.


Date: August 9, 2023			By: /s/ Mark DeVita

			Mark DeVita
			Chief Financial Officer and Executive Vice President

EXHIBIT 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Report of HERITAGE-CRYSTAL CLEAN, INC. (the “Company”) on Form 10-Q for the period ended June 30, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Brian Recatto, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.


Date: August 9, 2023			By: /s/ Brian Recatto

			Brian Recatto
			President, CEO and Director — Principal Executive Officer

EXHIBIT 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Report of HERITAGE-CRYSTAL CLEAN, INC. (the “Company”) on Form 10-Q for the period ended June 30, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Mark DeVita, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.


Date: August 9 2023			By: /s/ Mark DeVita

			Mark DeVita
			Chief Financial Officer and Executive Vice President

Cover - shares	6 Months Ended
Cover - shares	Jun. 30, 2023	Aug. 08, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2023
Document Transition Report	false
Entity File Number	001-33987
Entity Registrant Name	HERITAGE-CRYSTAL CLEAN, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	26-0351454
Entity Address, Address Line One	2000 Center Drive
Entity Address, Address Line Two	Suite East C300
Entity Address, City or Town	Hoffman Estates
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60192
City Area Code	847
Local Phone Number	836-5670
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	HCCI
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		24,370,405
Entity Central Index Key	0001403431
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Amendment Flag	false

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 33,100	$ 22,053
Accounts receivable - net	104,704	114,408
Inventory - net	47,024	40,727
Assets held for sale	0	1,125
Other current assets	14,652	12,989
Total current assets	199,480	191,302
Property, plant and equipment - net	232,318	222,942
Right of use assets	126,290	123,742
Equipment at customers - net	30,157	26,465
Software and intangible assets - net	97,091	102,335
Goodwill	112,236	112,236
Other assets	15,219	15,219
Total assets	812,791	794,241
Current liabilities:
Accounts payable	52,602	55,087
Current portion of lease liabilities	28,490	27,277
Contract liabilities - net	3,259	2,525
Accrued salaries, wages, and benefits	9,339	12,443
Taxes payable	3,211	6,037
Other current liabilities	10,553	12,382
Total current liabilities	107,454	115,751
Lease liabilities, net of current portion	103,426	100,738
Other long term liabilities	770	986
Long-term debt - net	84,479	89,383
Deferred income taxes	60,765	57,155
Total liabilities	356,894	364,013
STOCKHOLDERS' EQUITY:
Common stock - 36,000,000 shares authorized at $0.01 par value, 23,687,649 and 23,593,163 shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively	237	236
Additional paid-in capital	208,913	208,533
Retained earnings	247,057	221,826
Accumulated other comprehensive loss	(310)	(367)
Total stockholders' equity	455,897	430,228
Total liabilities and stockholders' equity	$ 812,791	$ 794,241

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Common stock, shares authorized (in shares)	36,000,000	36,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued (in shares)	23,687,649	23,593,163
Common stock, shares outstanding (in shares)	23,687,649	23,593,163

Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 18, 2022	Jun. 30, 2023	Jun. 18, 2022
Revenues
Revenues	$ 183,483	$ 150,373	$ 369,275	$ 283,762
Rental income	8,683	6,274	16,372	12,251
Total revenues	192,166	156,647	385,647	296,013
Operating expenses
Operating costs	146,387	104,755	286,448	206,538
Selling, general, and administrative expenses	20,361	15,024	38,061	28,759
Depreciation and amortization	11,802	6,777	23,969	13,285
Other (income) expense - net	(265)	1,001	(734)	791
Operating income	13,881	29,090	37,903	46,640
Interest expense – net	1,929	250	3,743	473
Income before income taxes	11,952	28,840	34,160	46,167
Provision for income taxes	3,310	7,733	8,929	12,182
Net income	$ 8,642	$ 21,107	$ 25,231	$ 33,985
Net income per share: basic (in dollars per share)	$ 0.36	$ 0.90	$ 1.07	$ 1.45
Net income per share: diluted (in dollars per share)	$ 0.36	$ 0.89	$ 1.06	$ 1.44
Number of weighted average shares outstanding: basic (in shares)	23,681	23,489	23,665	23,482
Number of weighted average shares outstanding: diluted (in shares)	23,931	23,644	23,898	23,640
Service revenues
Revenues
Revenues	$ 121,342	$ 75,584	$ 240,794	$ 144,500
Product revenues
Revenues
Revenues	$ 62,141	$ 74,789	$ 128,481	$ 139,262

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 18, 2022	Jun. 30, 2023	Jun. 18, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 8,642	$ 21,107	$ 25,231	$ 33,985
Other comprehensive income:
Currency translation adjustments	54	(121)	57	(75)
Total other comprehensive income (loss):	54	(121)	57	(75)
Comprehensive income	$ 8,696	$ 20,986	$ 25,288	$ 33,910

Condensed Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid–in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Jan. 01, 2022		23,473,931
Beginning balance at Jan. 01, 2022	$ 342,056	$ 235	$ 204,920	$ 137,067	$ (166)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,985			33,985
Currency translation adjustment	(75)				(75)
Issuance of common stock – ESPP (in shares)		8,627
Issuance of common stock – ESPP	251		251
Share-based compensation (in shares)		11,487
Share-based compensation	2,527		2,527
Share repurchases to satisfy tax withholding obligations	(1,402)		(1,402)
Ending balance (in shares) at Jun. 18, 2022		23,494,045
Ending balance at Jun. 18, 2022	377,342	$ 235	206,296	171,052	(241)
Beginning balance (in shares) at Mar. 26, 2022		23,477,764
Beginning balance at Mar. 26, 2022	356,450	$ 235	206,390	149,945	(120)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,107			21,107
Currency translation adjustment	(121)				(121)
Issuance of common stock – ESPP (in shares)		4,794
Issuance of common stock – ESPP	134		134
Share-based compensation (in shares)		11,487
Share-based compensation	1,174		1,174
Share repurchases to satisfy tax withholding obligations	(1,402)		(1,402)
Ending balance (in shares) at Jun. 18, 2022		23,494,045
Ending balance at Jun. 18, 2022	$ 377,342	$ 235	206,296	171,052	(241)
Beginning balance (in shares) at Dec. 31, 2022	23,593,163	23,593,163
Beginning balance at Dec. 31, 2022	$ 430,228	$ 236	208,533	221,826	(367)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25,231			25,231
Currency translation adjustment	57				57
Issuance of common stock – ESPP (in shares)		9,845
Issuance of common stock – ESPP	318		318
Share-based compensation (in shares)		84,641
Share-based compensation	2,198	$ 1	2,197
Share repurchases to satisfy tax withholding obligations	$ (2,135)		(2,135)
Ending balance (in shares) at Jun. 30, 2023	23,687,649	23,687,649
Ending balance at Jun. 30, 2023	$ 455,897	$ 237	208,913	247,057	(310)
Beginning balance (in shares) at Mar. 31, 2023		23,664,515
Beginning balance at Mar. 31, 2023	445,961	$ 237	207,673	238,415	(364)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,642			8,642
Currency translation adjustment	54				54
Issuance of common stock – ESPP (in shares)		5,070
Issuance of common stock – ESPP	170		170
Share-based compensation (in shares)		18,064
Share-based compensation	$ 1,070		1,070
Ending balance (in shares) at Jun. 30, 2023	23,687,649	23,687,649
Ending balance at Jun. 30, 2023	$ 455,897	$ 237	$ 208,913	$ 247,057	$ (310)

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 18, 2022	Jun. 30, 2023	Jun. 18, 2022	Dec. 31, 2022
Cash flows from Operating Activities:
Net income	$ 8,642	$ 21,107	$ 25,231	$ 33,985
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,802	6,777	23,969	13,285
Provision for civil action settlement			0	750
Uncollectible provision			1,270	453	$ 2,269
Share-based compensation			2,455	2,785
Deferred taxes			3,610	944
Other, net			(10)	1,099
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable			8,434	(18,207)
(Increase) in inventory			(6,297)	(6,685)
Decrease (increase) in other current assets			(538)	2,345
(Decrease) increase in accounts payable			(3,462)	8,091
(Decrease) increase in accrued liabilities			(7,823)	323
Cash provided by operating activities			46,839	39,168
Cash flows from Investing Activities:
Capital expenditures			(26,899)	(15,936)
Proceeds from sale of assets			1,578	96
Investment in Retriev			0	(3,000)
Cash used in investing activities			(25,321)	(18,840)
Cash flows from Financing Activities:
Credit line utilized			(5,000)	0
Repayment of principal on finance leases			(3,654)	(1,686)
Share repurchases to satisfy tax withholding obligations			(2,135)	(1,402)
Proceeds from the issuance of common stock			318	251
Cash used in financing activities			(10,471)	(2,837)
Net increase in cash and cash equivalents			11,047	17,491
Cash and cash equivalents, beginning of period			22,053	56,269	56,269
Cash and cash equivalents, end of period	$ 33,100	$ 73,760	33,100	73,760	$ 22,053
Supplemental disclosure of cash flow information:
Income taxes paid			9,683	11,796
Cash paid for interest			3,558	140
Supplemental disclosure of non-cash information:
Payables for construction in progress			$ 1,926	$ 874

ORGANIZATION AND NATURE OF OPERATIONS

6 Months Ended

Jun. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

ORGANIZATION AND NATURE OF OPERATIONS

Due to the Company's integrated business model, it is impracticable to separately present costs of tangible products and costs of services.

The table below shows the reporting periods as we refer to them in this report, their date ranges, and the number of days in each:

Reporting Period

Date Range

Number of Days

2023 second quarter

April 1, 2023 - June 30, 2023

2022 second quarter

March 27, 2022 - June 18, 2022

2023 first half

January 1, 2023 - June 30, 2023

181

2022 first half

January 2, 2022 - June 18, 2022

168

2023 fiscal year

January 1, 2023 - December 31, 2023

365

2022 fiscal year

January 2, 2022 - December 31, 2022

364

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	6 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Jun. 30, 2023
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES The Company's significant accounting policies are described in Note 2, "Summary of Significant Accounting Policies," in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2022. You should read the condensed consolidated financial statements in conjunction with our consolidated financial statements and related notes in our Annual Report on Form 10-K filed with the SEC on March 1, 2023. There have been no material changes in these policies or their application during the second quarter of fiscal 2023 except for the fiscal year change as further described in Note 1. In the opinion of management, all adjustments and disclosures necessary for the fair presentation of these interim statements have been included

BUSINESS COMBINATIONS

6 Months Ended

Jun. 30, 2023

Business Combination and Asset Acquisition [Abstract]

BUSINESS COMBINATIONS

The following table summarizes the estimated fair values of the assets acquired, net of cash acquired, related to Patriot at the acquisition date:



(thousands)	Patriot Environmental Services, Inc.(1)

Accounts receivable	$	25,381

Other current assets	2,034

Property, plant, & equipment	33,968

Intangible assets	62,200
Goodwill	62,541
Accounts payable and accruals	(12,929)

Deferred tax liabilities	(16,313)



Total purchase price, net of cash acquired	$	156,882



Less: placed in escrow	2,780
Net cash paid	$	154,102

Unaudited Pro Forma Financial Information


	Second Quarter Ended,
(thousands, except per share data)	June 30, 2023 (91 days)		June 18, 2022 (84 days)
Total revenues	$	192,166	$	184,361
Net income	$	8,642	$	21,065

Net income per share: basic	$	0.36	$	0.90
Net income per share: diluted	$	0.36	$	0.89


	First Half Ended,
(thousands, except per share data)	June 30, 2023 (181 days)		June 18, 2022 (168 days)
Total revenues	$	385,647	$	353,806
Net income	$	25,231	$	32,652

Net income per share: basic	$	1.07	$	1.39
Net income per share: diluted	$	1.06	$	1.38

REVENUE

6 Months Ended

Jun. 30, 2023

Revenue from Contract with Customer [Abstract]

REVENUE

The following table disaggregates our revenue by major lines:


	Second Quarter Ended,
	June 30, 2023 (91 days)								June 18, 2022 (84 days)
Total Net Sales by Major Lines of Business (thousands)	Environmental Services		Oil Business		Industrial and Field Services		Total		Environmental Services		Oil Business		Industrial and Field Services		Total
Parts Cleaning, Containerized Waste, & related products/services	$	57,885	$	—	$	1,455	$	59,340	$	49,217	$	—	$	1,103	$	50,320
Vacuum Services & Wastewater Treatment	21,116		—		6,458		27,574		15,089		—		6,061		21,150
Industrial & Field Services	—		—		38,556		38,556		—		—		6,539		6,539
Antifreeze Business	8,439		—		—		8,439		7,118		—		—		7,118
Environmental Services - Other	453		—		—		453		486		—		—		486
Re-refinery Product Sales	—		41,820		—		41,820		—		54,198		—		54,198
Oil Collection Services & RFO	—		6,002		—		6,002		—		9,253		—		9,253
Oil Filter Business	—		1,299		—		1,299		—		1,309		—		1,309
Revenues from Contracts with Customers	87,893		49,121		46,469		183,483		71,910		64,760		13,703		150,373
Rental Income	8,072		11		600		8,683		6,265		9		—		6,274
Total Revenues	$	95,965	$	49,132	$	47,069	$	192,166	$	78,175	$	64,769	$	13,703	$	156,647



	First Half Ended,
	June 30, 2023 (181 days)								June 18, 2022 (168 days)
Total Net Sales by Major Lines of Business (thousands)	Environmental Services		Oil Business		Industrial and Field Services		Total		Environmental Services		Oil Business		Industrial and Field Services		Total
Parts cleaning, containerized waste, & related products/services	$	114,543	$	—	$	2,924	$	117,467	$	95,340	$	—	$	1,836	$	97,176
Wastewater Vacuum Services	41,460		—		12,883		54,343		28,397		—		10,144		38,541
Field Services	—		—		76,304		76,304		—		—		12,829		12,829
Antifreeze Business	18,115		—		—		18,115		14,774		—		—		14,774
Environmental Services - Other	975		—		—		975		981		—		—		981
Re-refinery Product Sales	—		88,629		—		88,629		—		103,337		—		103,337
Oil Collection Services & RFO	—		10,740		—		10,740		—		13,566		—		13,566
Oil Filter Business	—		2,702		—		2,702		—		2,558		—		2,558
Revenues from Contracts with Customers	175,093		102,071		92,111		369,275		139,492		119,461		24,809		283,762
Rental income	15,639		17		716		16,372		12,228		23		—		12,251
Total Revenues	$	190,732	$	102,088	$	92,827	$	385,647	$	151,720	$	119,484	$	24,809	$	296,013

The following table provides information about contract assets and contract liabilities from contracts with customers:


(thousands)	June 30, 2023		December 31, 2022
Contract assets	$	—	$	133
Contract liabilities	3,259		2,658
Contract liabilities - net	$	3,259	$	2,525

ACCOUNTS RECEIVABLE

6 Months Ended

Jun. 30, 2023

Accounts Receivable, after Allowance for Credit Loss [Abstract]

ACCOUNTS RECEIVABLE

Accounts receivable for the second quarter ended June 30, 2023, and the fiscal year ended December 31, 2022 consisted of the following:


(thousands)	June 30, 2023		December 31, 2022
Trade	$	105,263	$	111,118
Less: allowance for uncollectible accounts	5,527		4,496
Trade - net	99,736		106,622
Related parties	4,437		6,777
Other	531		1,009
Total accounts receivable - net	$	104,704	$	114,408

The following table provides the changes in the Company’s allowance for uncollectible accounts for the first half ended June 30, 2023, and the fiscal year ended December 31, 2022:



(thousands)	June 30, 2023		December 31, 2022
Balance at beginning of period	$	4,496	$	2,928
Provision for uncollectible accounts	1,270		2,269
Accounts written off, net of recoveries	(239)		(701)
Balance at end of period	$	5,527	$	4,496

INVENTORY

6 Months Ended

Jun. 30, 2023

Inventory Disclosure [Abstract]

INVENTORY

The carrying value of inventory consisted of the following:


(thousands)	June 30, 2023		December 31, 2022
Solvents and solutions	$	11,829	$	10,792
Used oil and processed oil	18,991		14,904
Machines	7,206		6,329
Drums and supplies	6,543		6,476
Other	2,910		2,666
Total inventory	47,479		41,167
Less: machine refurbishing reserve	455		440
Total inventory - net	$	47,024	$	40,727

GOODWILL AND OTHER INTANGIBLE ASSETS

6 Months Ended

Jun. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

The following table shows changes to our goodwill balances by segment from December 31, 2022 to June 30, 2023:


(thousands)	Environmental Services		Industrial and Field Services		Total

Goodwill at December 31, 2022
Gross carrying amount	$	37,650	$	74,586	$	112,236

Net book value at December 31, 2022	$	37,650	$	74,586	$	112,236

Goodwill at June 30, 2023
Gross carrying amount	37,650		74,586		$	112,236

Net book value at June 30, 2023	$	37,650	$	74,586	$	112,236

The following is a summary of software and other intangible assets:


	June 30, 2023						December 31, 2022
(thousands)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer & supplier relationships	$	62,268	$	28,655	$	33,613	$	62,268	$	25,762	$	36,506
Permits	60,690		4,577		56,113		60,690		2,697		57,993
Software	10,090		3,992		6,098		13,643		7,378		6,265
Non-compete agreements	4,413		3,799		614		4,421		3,665		756
Patents, formulae, and licenses	1,769		1,003		766		1,769		971		798
Other*	601		714		(113)		597		580		17
Total software and intangible assets	$	139,831	$	42,740	$	97,091	$	143,388	$	41,053	$	102,335

*Other intangibles include an above market lease acquired in September 2021 that had a fair value of ($0.7) million upon acquisition and is being accreted over the remaining useful life of the lease.

The weighted average useful lives of software and other intangibles are as follows:


						Weighted Average Useful Life (years)
Permits						17
Patents, formulae, & licenses						15
Customer and supplier relationships						12
Software						9
Non-compete agreements						5
Other						7

The estimated amortization expense for the remainder of fiscal 2023 and each of the five succeeding fiscal years is as follows:


(millions)
Fiscal Year						Amortization Expense
2023						$4.8
2024						8.5
2025						7.5
2026						7.0
2027						6.9
2028						6.8

ACCOUNTS PAYABLE

6 Months Ended

Jun. 30, 2023

Payables and Accruals [Abstract]

ACCOUNTS PAYABLE

Accounts payable consisted of the following:


(thousands)	June 30, 2023		December 31, 2022
Accounts payable	$	51,763	$	54,935
Accounts payable - related parties	839		152
Total accounts payable	$	52,602	$	55,087

DEBT AND FINANCING ARRANGEMENTS

6 Months Ended

Jun. 30, 2023

Debt Disclosure [Abstract]

DEBT AND FINANCING ARRANGEMENTS

Bank Credit Facility

The Company's weighted average interest rate for all debt for the second quarter ended June 30, 2023 was 6.6%.

•An interest coverage ratio (based on interest expense and EBITDA) of at least 3.5 to 1.0;

The Credit Agreement places certain limitations on acquisitions and the payment of dividends.

Long-term debt at June 30, 2023 and December 31, 2022 consisted of the following:


(thousands)	June 30, 2023		December 31, 2022
Long-term debt	$	85,000	$	90,000
Less: unamortized debt issuance costs	521		617

Long-term debt - net	$	84,479	$	89,383

For the second quarter ended June 30, 2023, the Company recorded interest expense of $1.9 million with respect to our credit line and related amortization of debt issuance costs. For the second quarter ended June 18, 2022, the Company recorded interest expense of $0.3 million with respect to our term loan and credit line, and related amortization of debt issuance costs. For the first half of fiscal 2023, the Company recorded interest expense of $3.7 million with respect to our credit line and related amortization of debt issuance costs. For the first half of fiscal 2022, the Company recorded $0.5 million in amortization of debt issuance costs. As of June 30, 2023 and December 31, 2022, the Company was in compliance with all covenants under its Credit Agreement. As of June 30, 2023 and December 31, 2022, the Company had $6.0 million of standby letters of credit issued for both periods, and $59.0 million and $54.0 million was available for borrowing under the bank credit facility, respectively.

SEGMENT INFORMATION

6 Months Ended

Jun. 30, 2023

Segment Reporting [Abstract]

SEGMENT INFORMATION

Segment results for the second quarter ended June 30, 2023 and June 18, 2022 were as follows:


Second Quarter Ended,
June 30, 2023 (91 days)
(thousands)		Environmental Services		Oil Business		Industrial and Field Services		Corporate and Eliminations		Consolidated

Revenues
	Service revenues	$	72,018	$	2,855	$	46,469	$	—	$	121,342
	Product revenues	15,875		46,266		—		—		62,141
	Rental income	8,072		11		600		—		8,683
Total revenues		$	95,965	$	49,132	$	47,069	$	—	$	192,166
Operating expenses
	Operating costs	68,459		40,781		37,147		—		146,387
	Operating depreciation and amortization	3,641		2,675		2,398		—		8,714
Profit before corporate selling, general, and administrative expenses		$	23,865	$	5,676	$	7,524	$	—	$	37,065
Selling, general, and administrative expenses								20,361		20,361
Depreciation and amortization from SG&A								3,088		3,088
Total selling, general, and administrative expenses								$	23,449	$	23,449
Other (income) - net								(265)		(265)
Operating income										13,881
Interest expense – net								1,929		1,929
Income before income taxes										$	11,952


Second Quarter Ended,
June 18, 2022 (84 days)
(thousands)		Environmental Services		Oil Business		Industrial and Field Services		Corporate and Eliminations		Consolidated

Revenues
	Service revenues	$	59,277	$	2,604	$	13,703	$	—	$	75,584
	Product revenues	12,633		62,156		—		—		74,789
	Rental income	6,265		9		—		—		6,274
Total revenues		$	78,175	$	64,769	$	13,703	$	—	$	156,647
Operating expenses
	Operating costs	56,812		35,841		12,102		—		104,755
	Operating depreciation and amortization	2,769		2,125		423		—		5,317
Profit before corporate selling, general, and administrative expenses		$	18,594	$	26,803	$	1,178	$	—	$	46,575
Selling, general, and administrative expenses								15,024		15,024
Depreciation and amortization from SG&A								1,460		1,460
Total selling, general, and administrative expenses								$	16,484	$	16,484
Other expense - net								1,001		1,001
Operating income										29,090
Interest expense – net								250		250
Income before income taxes										$	28,840


First Half Ended,
June 30, 2023 (181 days)
(thousands)		Environmental Services		Oil Business		Industrial and Field Services		Corporate and Eliminations		Consolidated

Revenues
	Service revenues	$	143,018	$	5,665	$	92,111	$	—	$	240,794
	Product revenues	32,075		96,406		—		—		128,481
	Rental income	15,639		17		716		—		16,372
Total revenues		$	190,732	$	102,088	$	92,827	$	—	$	385,647
Operating expenses
	Operating costs	136,999		77,079		72,370		—		286,448
	Operating depreciation and amortization	7,140		5,280		5,476		—		17,896
Profit before corporate selling, general, and administrative expenses		$	46,593	$	19,729	$	14,981	$	—	$	81,303
Selling, general, and administrative expenses								38,061		38,061
Depreciation and amortization from SG&A								6,073		6,073
Total selling, general, and administrative expenses								$	44,134	$	44,134
Other (income) - net								(734)		(734)
Operating income										37,903
Interest expense – net								3,743		3,743
Income before income taxes										$	34,160


First Half Ended,
June 18, 2022 (168 days)
(thousands)		Environmental Services		Oil Business		Industrial and Field Services		Corporate and Eliminations		Consolidated

Revenues
	Service revenues	$	114,479	$	5,212	$	24,809	$	—	$	144,500
	Product revenues	25,013		114,249		—		—		139,262
	Rental income	12,228		23		—		—		12,251
Total revenues		$	151,720	$	119,484	$	24,809	$	—	$	296,013
Operating expenses
	Operating costs	114,837		70,006		21,695		—		206,538
	Operating depreciation and amortization	5,236		4,209		845		—		10,290
Profit before corporate selling, general, and administrative expenses		$	31,647	$	45,269	$	2,269	$	—	$	79,185
Selling, general, and administrative expenses								28,759		28,759
Depreciation and amortization from SG&A								2,995		2,995
Total selling, general, and administrative expenses								$	31,754	$	31,754
Other expense - net								791		791
Operating income										46,640
Interest expense – net								473		473
Income before income taxes										$	46,167

Total assets by segment as of June 30, 2023 and December 31, 2022 were as follows:


(thousands)		June 30, 2023		December 31, 2022
Total Assets:
	Environmental Services	$	258,031	$	253,906
	Oil Business	186,153		190,862
	Industrial and Field Services	290,210		283,683
	Unallocated Corporate Assets	78,397		65,790
Total		$	812,791	$	794,241

COMMITMENTS AND CONTINGENCIES

6 Months Ended

Jun. 30, 2023

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

LEASES

Lessee

Lessor

Rental income was as follows:


	Second Quarter Ended,
	June 30, 2023 (91 days)								June 18, 2022 (84 days)
(thousands)	Environmental Services		Oil Business		Industrial and Field Services		Total		Environmental Services		Oil Business		Industrial and Field Services		Total
Parts Cleaning	$	7,968	$	—	$	600	$	8,568	$	6,233	$	—	$	—	$	6,233
Property	104		11		—		115		32		9		—		41
Total rental income	$	8,072	$	11	$	600	$	8,683	$	6,265	$	9	$	—	$	6,274



	First Half Ended,
	June 30, 2023 (181 days)								June 18, 2022 (168 days)
(thousands)	Environmental Services		Oil Business		Industrial and Field Services		Total		Environmental Services		Oil Business		Industrial and Field Services		Total
Parts Cleaning	$	15,518	$	—	$	716	$	16,234	$	12,172	$	—	$	—	$	12,172

Property	121		17		—		138		56		23		—		79
Total rental income	$	15,639	$	17	$	716	$	16,372	$	12,228	$	23	$	—	$	12,251

Purchase Obligations

Litigation and Claims

INCOME TAXES	6 Months Ended
INCOME TAXES	Jun. 30, 2023
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES Income tax expense for the second fiscal quarter of 2023 was $3.3 million. The Company's effective income tax rate for the second quarter of fiscal 2023 was 27.7% compared to 27.0% in the second quarter of fiscal 2022. Tax expense for the first half of 2023 was $8.9 million. The Company’s effective income tax rate for the first half of 2023 was 26.1% compared to 26.4% in the first half of 2022. The rate decrease is principally attributable to the increased impact of certain favorable adjustments to financial reporting income due to decreased levels of profitability as compared to the first half of fiscal 2022. The Company establishes reserves when it is more likely than not that the Company will not realize the full tax benefit of a position. The Company had a reserve of $2.2 million for uncertain tax positions as of June 30, 2023. The gross unrecognized tax benefits would, if recognized, decrease the Company's effective tax rate. As of June 30, 2023, the Company believes it is more likely than not that a benefit from foreign net operating loss carryforwards will not be realized. The Company provided a valuation allowance against those foreign net operating loss carryforwards of $0.7 million.

SHARE-BASED COMPENSATION

6 Months Ended

Jun. 30, 2023

Share-Based Payment Arrangement [Abstract]

SHARE-BASED COMPENSATION

Restricted Stock Compensation/Awards

The following table shows a summary of restricted share grants and expense resulting from the awards:


			Compensation Expense
(thousands, except share amounts)			First Half Ended,				Unrecognized Expense as of,
Recipient of Grant	Grant Date	Restricted Shares	June 30, 2023 (181 days)		June 18, 2022 (168 days)		June 30, 2023 (181 days)		June 18, 2022 (168 days)
Special Incentive Grant	April, 2018	350,000	$	—	$	380	$	—	$	—
Members of Management	February, 2020	41,138	—		40		—		47
Members of Management	February, 2021	35,898	104		103		103		345
Chief Executive Officer	February, 2021	500,000	502		1,067		1,334		2,814
Members of Management	February, 2022	75,355	249		245		735		1,303
Members of Management	February, 2023	66,024	310		248		1,552		—
Board of Directors	April, 2022	17,082	—		234		—		246
Special Incentive Grant	November, 2022	147,623	524		—		2,339		—
Board of Directors	May, 2023	14,274	280		—		200		—

At June 30, 2023, there was $6.3 million of unrecognized stock-based compensation expense which is expected to be recognized over a weighted-average remaining vesting period of 1.7 years.

average closing price of a share of the Company's common stock for the 90-day period ending on the vesting date). If the stock price does not increase by $5.00, then no shares shall vest.


Vesting Table
Increase in Stock Price From the Amended Agreement Commencement Date to the Vesting Date						Total Percentage of Restricted Stock Shares to Be Vested
Less than $5 per share increase						—%
$5 per share increase						25% (vest in 125,000 shares)
$10 per share increase						50% (vest in 250,000 shares)
$15 per share increase						75% (vest in 375,000 shares)
$20 or more per share increase						100% (vest in 500,000 shares)

Provision for possible accelerated vesting of award

The following table summarizes the restricted stock activity for the second quarter ended June 30, 2023:


Restricted Stock (Nonvested Shares)	Number of Shares	Weighted Average Grant-Date Fair Value Per Share
Nonvested shares outstanding at December 31, 2022	728,693	$	21.83
Granted	80,298	37.08
Vested	(99,487)	25.51
Forfeited	(28,797)	21.95
Nonvested shares outstanding at June 30, 2023	680,707	$	25.79

Employee Stock Purchase Plan

EARNINGS PER SHARE

6 Months Ended

Jun. 30, 2023

Earnings Per Share [Abstract]

EARNINGS PER SHARE

EARNINGS PER SHAREThe following table reconciles the number of shares outstanding for the second quarter of fiscal 2023 and 2022, respectively, to the number of weighted average basic shares outstanding and the number of weighted average diluted shares outstanding for the purposes of calculating basic and diluted earnings per share:


	Second Quarter Ended,				First Half Ended,
(thousands, except per share amounts)	June 30, 2023 (91 days)		June 18, 2022 (84 days)		June 30, 2023 (181 days)		June 18, 2022 (168 days)
Net income	$	8,642	$	21,107	$	25,231	$	33,985



Weighted average basic shares outstanding	23,681		23,489		23,665		23,482
Dilutive shares for share–based compensation plans	250		155		233		158
Weighted average diluted shares outstanding	23,931		23,644		23,898		23,640





Net income per share: basic	$	0.36	$	0.90	$	1.07	$	1.45
Net income per share: diluted	$	0.36	$	0.89	$	1.06	$	1.44

FAIR VALUE MEASUREMENTS

6 Months Ended

Jun. 30, 2023

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

Recurring Fair Value Measurements

The following tables summarize assets measured at fair value on a recurring basis (in millions) as of June 30, 2023:


	Quoted prices in active markets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)	Fair Value Measurements
Equity Securities (1)	$—	$—	$15.2	$15.2

SUBSEQUENT EVENTS	6 Months Ended
SUBSEQUENT EVENTS	Jun. 30, 2023
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS On July 19, 2023, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with JFL-Tiger Acquisition Co., Inc., a Delaware corporation (“Parent”), and JFL-Tiger Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of Parent (“Merger Sub”), pursuant to which, upon the terms and subject to the conditions set forth therein, Merger Sub will merge with and into the Company, with the Company surviving the merger as a wholly-owned subsidiary of Parent (the “Merger,” and together with the transactions contemplated by the Merger Agreement, the “Transaction”). Pursuant to the Merger Agreement, at the effective time of the Merger (the “Effective Time”), each share of common stock of the Company then outstanding will be converted into the right to receive $45.50 in cash, without interest (the “Per Share Merger Consideration”), less any applicable withholding taxes, other than any shares as to which dissenters’ rights have been perfected (and not withdrawn or lost) in accordance with applicable law (which will be cancelled and converted into the right to receive a payment determined in accordance with Section 262 of the Delaware General Corporation Law). The Merger Agreement also provides that immediately prior to the Effective Time, by virtue of the Merger and without any action on the part of the holder thereof (1) each outstanding Company restricted stock award will become fully vested and the restrictions with respect thereto will lapse, and all Company restricted stock awards will be treated in the Merger in the same manner as the other shares of Company Common Stock, and (2) each award of Company restricted stock units (“RSU”) that is outstanding immediately prior to the Effective Time will automatically be cancelled and converted into the right to receive a cash payment in an amount, without interest thereon and subject to applicable withholding taxes, equal to the product of (x) the Per Share Merger Consideration and (y) the total number of shares of common stock of the Company subject to such award of RSUs as of immediately prior to the Effective Time. The obligations of the parties to consummate the Merger are subject to the satisfaction or waiver of customary closing conditions set forth in the Merger Agreement, including, among other conditions, (1) the adoption of the Merger Agreement by the affirmative vote of the stockholders of the Company of not less than 75% of the issued and outstanding shares of common stock of the Company (the “Company Stockholder Approval”), (2) the expiration or termination of any waiting period applicable under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and (3) the absence of a “Company Material Adverse Effect” (as defined in the Merger Agreement) with respect to the Company. Each of the Company, Parent and Merger Sub has made customary representations and warranties and covenants in the Merger Agreement, including covenants to use their respective reasonable best efforts to effect the Transaction, including securing regulatory approvals required by the Merger Agreement. In addition, the Company has agreed to other customary covenants, including, among others, covenants to conduct its business in the ordinary course during the interim period between the execution of the Merger Agreement and the closing of the Merger. The Merger Agreement contains customary termination rights for each of Parent and the Company, including, among others, if (1) the Merger has not been consummated by February 29, 2024 (the “End Date”), (2) the requisite Company Stockholder Approval is not obtained, (3) there is any order or applicable law prohibiting or permanently enjoining the Transaction or (4) the other party breaches its covenants or representations and such breach is not cured within a specified period and would result in the failure of a closing condition in favor of the other party. In addition, the Company may terminate the Merger Agreement in order for the board of directors of the Company to cause or permit the Company to enter into an Alternative Acquisition Agreement with respect to a Superior Proposal, and Parent may terminate the Merger Agreement if the board of directors of the Company changes its recommendation in favor of the Transaction. The Merger Agreement further provides that, upon termination of the Merger Agreement under certain specified circumstances, the Company will be required to pay Parent a termination fee of $42,331,515 (except in the case the Merger Agreement is terminated in connection with a Superior Proposal during the Go-Shop Period, and certain other limited circumstances, in which case such termination fee will be $23,584,701), or Parent will be required to pay the Company a termination fee of $72,568,311 (the “Parent Termination Fee”). The Merger is not subject to a financing condition. Parent has obtained (1) equity financing commitments from certain investment affiliates of J.F. Lehman & Company, LLC (“JFLCO”) and certain investment affiliates of HarbourVest Partners, and (2) debt financing commitments from certain third-party lenders, to fund the transactions contemplated by the Merger Agreement. The Merger Agreement requires Parent to use its reasonable best efforts to obtain the financing on the terms and conditions described in the financing commitments. The Company is entitled to specific performance, subject to the terms and conditions of the Merger Agreement and the applicable equity commitments, to force Parent to close the transaction if all closing conditions are met. In addition, an investment affiliate of JFLCO has also provided a limited guarantee in favor of the Company (the “Limited Guarantee”) with respect to certain obligations of Parent and Merger Sub under the Merger Agreement, including a guarantee of payment of the Parent Termination Fee and certain other reimbursement obligations that may be owed by Parent pursuant to the Merger Agreement.

ORGANIZATION AND NATURE OF OPERATIONS (Policies)

6 Months Ended

Jun. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Fiscal Period

The table below shows the reporting periods as we refer to them in this report, their date ranges, and the number of days in each:

Reporting Period

Date Range

Number of Days

2023 second quarter

April 1, 2023 - June 30, 2023

2022 second quarter

March 27, 2022 - June 18, 2022

2023 first half

January 1, 2023 - June 30, 2023

181

2022 first half

January 2, 2022 - June 18, 2022

168

2023 fiscal year

January 1, 2023 - December 31, 2023

365

2022 fiscal year

January 2, 2022 - December 31, 2022

364

Revenue

Accounts Receivable

ORGANIZATION AND NATURE OF OPERATIONS (Tables)

6 Months Ended

Jun. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Reporting Periods

The table below shows the reporting periods as we refer to them in this report, their date ranges, and the number of days in each:

Reporting Period

Date Range

Number of Days

2023 second quarter

April 1, 2023 - June 30, 2023

2022 second quarter

March 27, 2022 - June 18, 2022

2023 first half

January 1, 2023 - June 30, 2023

181

2022 first half

January 2, 2022 - June 18, 2022

168

2023 fiscal year

January 1, 2023 - December 31, 2023

365

2022 fiscal year

January 2, 2022 - December 31, 2022

364

BUSINESS COMBINATIONS (Tables)

6 Months Ended

Jun. 30, 2023

Business Combination and Asset Acquisition [Abstract]

Schedule Estimated Fair Values of Assets Acquired, Net of Cash Acquired

The following table summarizes the estimated fair values of the assets acquired, net of cash acquired, related to Patriot at the acquisition date:



(thousands)	Patriot Environmental Services, Inc.(1)

Accounts receivable	$	25,381

Other current assets	2,034

Property, plant, & equipment	33,968

Intangible assets	62,200
Goodwill	62,541
Accounts payable and accruals	(12,929)

Deferred tax liabilities	(16,313)



Total purchase price, net of cash acquired	$	156,882



Less: placed in escrow	2,780
Net cash paid	$	154,102

Schedule of Unaudited Pro Forma Financial Information


	Second Quarter Ended,
(thousands, except per share data)	June 30, 2023 (91 days)		June 18, 2022 (84 days)
Total revenues	$	192,166	$	184,361
Net income	$	8,642	$	21,065

Net income per share: basic	$	0.36	$	0.90
Net income per share: diluted	$	0.36	$	0.89


	First Half Ended,
(thousands, except per share data)	June 30, 2023 (181 days)		June 18, 2022 (168 days)
Total revenues	$	385,647	$	353,806
Net income	$	25,231	$	32,652

Net income per share: basic	$	1.07	$	1.39
Net income per share: diluted	$	1.06	$	1.38

REVENUE (Tables)

6 Months Ended

Jun. 30, 2023

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue by Major Lines

The following table disaggregates our revenue by major lines:


	Second Quarter Ended,
	June 30, 2023 (91 days)								June 18, 2022 (84 days)
Total Net Sales by Major Lines of Business (thousands)	Environmental Services		Oil Business		Industrial and Field Services		Total		Environmental Services		Oil Business		Industrial and Field Services		Total
Parts Cleaning, Containerized Waste, & related products/services	$	57,885	$	—	$	1,455	$	59,340	$	49,217	$	—	$	1,103	$	50,320
Vacuum Services & Wastewater Treatment	21,116		—		6,458		27,574		15,089		—		6,061		21,150
Industrial & Field Services	—		—		38,556		38,556		—		—		6,539		6,539
Antifreeze Business	8,439		—		—		8,439		7,118		—		—		7,118
Environmental Services - Other	453		—		—		453		486		—		—		486
Re-refinery Product Sales	—		41,820		—		41,820		—		54,198		—		54,198
Oil Collection Services & RFO	—		6,002		—		6,002		—		9,253		—		9,253
Oil Filter Business	—		1,299		—		1,299		—		1,309		—		1,309
Revenues from Contracts with Customers	87,893		49,121		46,469		183,483		71,910		64,760		13,703		150,373
Rental Income	8,072		11		600		8,683		6,265		9		—		6,274
Total Revenues	$	95,965	$	49,132	$	47,069	$	192,166	$	78,175	$	64,769	$	13,703	$	156,647



	First Half Ended,
	June 30, 2023 (181 days)								June 18, 2022 (168 days)
Total Net Sales by Major Lines of Business (thousands)	Environmental Services		Oil Business		Industrial and Field Services		Total		Environmental Services		Oil Business		Industrial and Field Services		Total
Parts cleaning, containerized waste, & related products/services	$	114,543	$	—	$	2,924	$	117,467	$	95,340	$	—	$	1,836	$	97,176
Wastewater Vacuum Services	41,460		—		12,883		54,343		28,397		—		10,144		38,541
Field Services	—		—		76,304		76,304		—		—		12,829		12,829
Antifreeze Business	18,115		—		—		18,115		14,774		—		—		14,774
Environmental Services - Other	975		—		—		975		981		—		—		981
Re-refinery Product Sales	—		88,629		—		88,629		—		103,337		—		103,337
Oil Collection Services & RFO	—		10,740		—		10,740		—		13,566		—		13,566
Oil Filter Business	—		2,702		—		2,702		—		2,558		—		2,558
Revenues from Contracts with Customers	175,093		102,071		92,111		369,275		139,492		119,461		24,809		283,762
Rental income	15,639		17		716		16,372		12,228		23		—		12,251
Total Revenues	$	190,732	$	102,088	$	92,827	$	385,647	$	151,720	$	119,484	$	24,809	$	296,013

Schedule of Contract Assets and Contract Liabilities

The following table provides information about contract assets and contract liabilities from contracts with customers:


(thousands)	June 30, 2023		December 31, 2022
Contract assets	$	—	$	133
Contract liabilities	3,259		2,658
Contract liabilities - net	$	3,259	$	2,525

ACCOUNTS RECEIVABLE (Tables)

6 Months Ended

Jun. 30, 2023

Accounts Receivable, after Allowance for Credit Loss [Abstract]

Schedule of Accounts Receivable

Accounts receivable for the second quarter ended June 30, 2023, and the fiscal year ended December 31, 2022 consisted of the following:


(thousands)	June 30, 2023		December 31, 2022
Trade	$	105,263	$	111,118
Less: allowance for uncollectible accounts	5,527		4,496
Trade - net	99,736		106,622
Related parties	4,437		6,777
Other	531		1,009
Total accounts receivable - net	$	104,704	$	114,408

The following table provides the changes in the Company’s allowance for uncollectible accounts for the first half ended June 30, 2023, and the fiscal year ended December 31, 2022:



(thousands)	June 30, 2023		December 31, 2022
Balance at beginning of period	$	4,496	$	2,928
Provision for uncollectible accounts	1,270		2,269
Accounts written off, net of recoveries	(239)		(701)
Balance at end of period	$	5,527	$	4,496

INVENTORY (Tables)

6 Months Ended

Jun. 30, 2023

Inventory Disclosure [Abstract]

Schedule of Inventory

The carrying value of inventory consisted of the following:


(thousands)	June 30, 2023		December 31, 2022
Solvents and solutions	$	11,829	$	10,792
Used oil and processed oil	18,991		14,904
Machines	7,206		6,329
Drums and supplies	6,543		6,476
Other	2,910		2,666
Total inventory	47,479		41,167
Less: machine refurbishing reserve	455		440
Total inventory - net	$	47,024	$	40,727

GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table shows changes to our goodwill balances by segment from December 31, 2022 to June 30, 2023:


(thousands)	Environmental Services		Industrial and Field Services		Total

Goodwill at December 31, 2022
Gross carrying amount	$	37,650	$	74,586	$	112,236

Net book value at December 31, 2022	$	37,650	$	74,586	$	112,236

Goodwill at June 30, 2023
Gross carrying amount	37,650		74,586		$	112,236

Net book value at June 30, 2023	$	37,650	$	74,586	$	112,236

Schedule of Finite-Lived Intangible Assets

The following is a summary of software and other intangible assets:


	June 30, 2023						December 31, 2022
(thousands)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer & supplier relationships	$	62,268	$	28,655	$	33,613	$	62,268	$	25,762	$	36,506
Permits	60,690		4,577		56,113		60,690		2,697		57,993
Software	10,090		3,992		6,098		13,643		7,378		6,265
Non-compete agreements	4,413		3,799		614		4,421		3,665		756
Patents, formulae, and licenses	1,769		1,003		766		1,769		971		798
Other*	601		714		(113)		597		580		17
Total software and intangible assets	$	139,831	$	42,740	$	97,091	$	143,388	$	41,053	$	102,335

*Other intangibles include an above market lease acquired in September 2021 that had a fair value of ($0.7) million upon acquisition and is being accreted over the remaining useful life of the lease.

The weighted average useful lives of software and other intangibles are as follows:


						Weighted Average Useful Life (years)
Permits						17
Patents, formulae, & licenses						15
Customer and supplier relationships						12
Software						9
Non-compete agreements						5
Other						7

Schedule of Finite-lived Intangible Assets Amortization Expense

The estimated amortization expense for the remainder of fiscal 2023 and each of the five succeeding fiscal years is as follows:


(millions)
Fiscal Year						Amortization Expense
2023						$4.8
2024						8.5
2025						7.5
2026						7.0
2027						6.9
2028						6.8

ACCOUNTS PAYABLE (Tables)

6 Months Ended

Jun. 30, 2023

Payables and Accruals [Abstract]

Schedule of Accounts Payable

Accounts payable consisted of the following:


(thousands)	June 30, 2023		December 31, 2022
Accounts payable	$	51,763	$	54,935
Accounts payable - related parties	839		152
Total accounts payable	$	52,602	$	55,087

DEBT AND FINANCING ARRANGEMENTS (Tables)

6 Months Ended

Jun. 30, 2023

Debt Disclosure [Abstract]

Schedule of Long-term Debt

Long-term debt at June 30, 2023 and December 31, 2022 consisted of the following:


(thousands)	June 30, 2023		December 31, 2022
Long-term debt	$	85,000	$	90,000
Less: unamortized debt issuance costs	521		617

Long-term debt - net	$	84,479	$	89,383

SEGMENT INFORMATION (Tables)

6 Months Ended

Jun. 30, 2023

Segment Reporting [Abstract]

Schedule of Reconciliation of Segment Results to Consolidated

Segment results for the second quarter ended June 30, 2023 and June 18, 2022 were as follows:


Second Quarter Ended,
June 30, 2023 (91 days)
(thousands)		Environmental Services		Oil Business		Industrial and Field Services		Corporate and Eliminations		Consolidated

Revenues
	Service revenues	$	72,018	$	2,855	$	46,469	$	—	$	121,342
	Product revenues	15,875		46,266		—		—		62,141
	Rental income	8,072		11		600		—		8,683
Total revenues		$	95,965	$	49,132	$	47,069	$	—	$	192,166
Operating expenses
	Operating costs	68,459		40,781		37,147		—		146,387
	Operating depreciation and amortization	3,641		2,675		2,398		—		8,714
Profit before corporate selling, general, and administrative expenses		$	23,865	$	5,676	$	7,524	$	—	$	37,065
Selling, general, and administrative expenses								20,361		20,361
Depreciation and amortization from SG&A								3,088		3,088
Total selling, general, and administrative expenses								$	23,449	$	23,449
Other (income) - net								(265)		(265)
Operating income										13,881
Interest expense – net								1,929		1,929
Income before income taxes										$	11,952


Second Quarter Ended,
June 18, 2022 (84 days)
(thousands)		Environmental Services		Oil Business		Industrial and Field Services		Corporate and Eliminations		Consolidated

Revenues
	Service revenues	$	59,277	$	2,604	$	13,703	$	—	$	75,584
	Product revenues	12,633		62,156		—		—		74,789
	Rental income	6,265		9		—		—		6,274
Total revenues		$	78,175	$	64,769	$	13,703	$	—	$	156,647
Operating expenses
	Operating costs	56,812		35,841		12,102		—		104,755
	Operating depreciation and amortization	2,769		2,125		423		—		5,317
Profit before corporate selling, general, and administrative expenses		$	18,594	$	26,803	$	1,178	$	—	$	46,575
Selling, general, and administrative expenses								15,024		15,024
Depreciation and amortization from SG&A								1,460		1,460
Total selling, general, and administrative expenses								$	16,484	$	16,484
Other expense - net								1,001		1,001
Operating income										29,090
Interest expense – net								250		250
Income before income taxes										$	28,840


First Half Ended,
June 30, 2023 (181 days)
(thousands)		Environmental Services		Oil Business		Industrial and Field Services		Corporate and Eliminations		Consolidated

Revenues
	Service revenues	$	143,018	$	5,665	$	92,111	$	—	$	240,794
	Product revenues	32,075		96,406		—		—		128,481
	Rental income	15,639		17		716		—		16,372
Total revenues		$	190,732	$	102,088	$	92,827	$	—	$	385,647
Operating expenses
	Operating costs	136,999		77,079		72,370		—		286,448
	Operating depreciation and amortization	7,140		5,280		5,476		—		17,896
Profit before corporate selling, general, and administrative expenses		$	46,593	$	19,729	$	14,981	$	—	$	81,303
Selling, general, and administrative expenses								38,061		38,061
Depreciation and amortization from SG&A								6,073		6,073
Total selling, general, and administrative expenses								$	44,134	$	44,134
Other (income) - net								(734)		(734)
Operating income										37,903
Interest expense – net								3,743		3,743
Income before income taxes										$	34,160


First Half Ended,
June 18, 2022 (168 days)
(thousands)		Environmental Services		Oil Business		Industrial and Field Services		Corporate and Eliminations		Consolidated

Revenues
	Service revenues	$	114,479	$	5,212	$	24,809	$	—	$	144,500
	Product revenues	25,013		114,249		—		—		139,262
	Rental income	12,228		23		—		—		12,251
Total revenues		$	151,720	$	119,484	$	24,809	$	—	$	296,013
Operating expenses
	Operating costs	114,837		70,006		21,695		—		206,538
	Operating depreciation and amortization	5,236		4,209		845		—		10,290
Profit before corporate selling, general, and administrative expenses		$	31,647	$	45,269	$	2,269	$	—	$	79,185
Selling, general, and administrative expenses								28,759		28,759
Depreciation and amortization from SG&A								2,995		2,995
Total selling, general, and administrative expenses								$	31,754	$	31,754
Other expense - net								791		791
Operating income										46,640
Interest expense – net								473		473
Income before income taxes										$	46,167

Schedule of Reconciliation of Assets by Segment to Consolidated

Total assets by segment as of June 30, 2023 and December 31, 2022 were as follows:


(thousands)		June 30, 2023		December 31, 2022
Total Assets:
	Environmental Services	$	258,031	$	253,906
	Oil Business	186,153		190,862
	Industrial and Field Services	290,210		283,683
	Unallocated Corporate Assets	78,397		65,790
Total		$	812,791	$	794,241

COMMITMENTS AND CONTINGENCIES (Tables)

6 Months Ended

Jun. 30, 2023

Commitments and Contingencies Disclosure [Abstract]

Schedule of Rental Income

Rental income was as follows:


	Second Quarter Ended,
	June 30, 2023 (91 days)								June 18, 2022 (84 days)
(thousands)	Environmental Services		Oil Business		Industrial and Field Services		Total		Environmental Services		Oil Business		Industrial and Field Services		Total
Parts Cleaning	$	7,968	$	—	$	600	$	8,568	$	6,233	$	—	$	—	$	6,233
Property	104		11		—		115		32		9		—		41
Total rental income	$	8,072	$	11	$	600	$	8,683	$	6,265	$	9	$	—	$	6,274



	First Half Ended,
	June 30, 2023 (181 days)								June 18, 2022 (168 days)
(thousands)	Environmental Services		Oil Business		Industrial and Field Services		Total		Environmental Services		Oil Business		Industrial and Field Services		Total
Parts Cleaning	$	15,518	$	—	$	716	$	16,234	$	12,172	$	—	$	—	$	12,172

Property	121		17		—		138		56		23		—		79
Total rental income	$	15,639	$	17	$	716	$	16,372	$	12,228	$	23	$	—	$	12,251

SHARE-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Restricted Stock Unit Activity

The following table shows a summary of restricted share grants and expense resulting from the awards:


			Compensation Expense
(thousands, except share amounts)			First Half Ended,				Unrecognized Expense as of,
Recipient of Grant	Grant Date	Restricted Shares	June 30, 2023 (181 days)		June 18, 2022 (168 days)		June 30, 2023 (181 days)		June 18, 2022 (168 days)
Special Incentive Grant	April, 2018	350,000	$	—	$	380	$	—	$	—
Members of Management	February, 2020	41,138	—		40		—		47
Members of Management	February, 2021	35,898	104		103		103		345
Chief Executive Officer	February, 2021	500,000	502		1,067		1,334		2,814
Members of Management	February, 2022	75,355	249		245		735		1,303
Members of Management	February, 2023	66,024	310		248		1,552		—
Board of Directors	April, 2022	17,082	—		234		—		246
Special Incentive Grant	November, 2022	147,623	524		—		2,339		—
Board of Directors	May, 2023	14,274	280		—		200		—

The following table summarizes the restricted stock activity for the second quarter ended June 30, 2023:


Restricted Stock (Nonvested Shares)	Number of Shares	Weighted Average Grant-Date Fair Value Per Share
Nonvested shares outstanding at December 31, 2022	728,693	$	21.83
Granted	80,298	37.08
Vested	(99,487)	25.51
Forfeited	(28,797)	21.95
Nonvested shares outstanding at June 30, 2023	680,707	$	25.79

Schedule of Restricted Stock Vesting Percentages


Vesting Table
Increase in Stock Price From the Amended Agreement Commencement Date to the Vesting Date						Total Percentage of Restricted Stock Shares to Be Vested
Less than $5 per share increase						—%
$5 per share increase						25% (vest in 125,000 shares)
$10 per share increase						50% (vest in 250,000 shares)
$15 per share increase						75% (vest in 375,000 shares)
$20 or more per share increase						100% (vest in 500,000 shares)

EARNINGS PER SHARE (Tables)

6 Months Ended

Jun. 30, 2023

Earnings Per Share [Abstract]

Schedule of Weighted Average Basic and Diluted Shares Outstanding


	Second Quarter Ended,				First Half Ended,
(thousands, except per share amounts)	June 30, 2023 (91 days)		June 18, 2022 (84 days)		June 30, 2023 (181 days)		June 18, 2022 (168 days)
Net income	$	8,642	$	21,107	$	25,231	$	33,985



Weighted average basic shares outstanding	23,681		23,489		23,665		23,482
Dilutive shares for share–based compensation plans	250		155		233		158
Weighted average diluted shares outstanding	23,931		23,644		23,898		23,640





Net income per share: basic	$	0.36	$	0.90	$	1.07	$	1.45
Net income per share: diluted	$	0.36	$	0.89	$	1.06	$	1.44

FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2023

Fair Value Disclosures [Abstract]

Schedule of Assets Measured at Fair Value on Recurring Basis

The following tables summarize assets measured at fair value on a recurring basis (in millions) as of June 30, 2023:


	Quoted prices in active markets (Level 1)	Significant other observable inputs (Level 2)	Significant unobservable inputs (Level 3)	Fair Value Measurements
Equity Securities (1)	$—	$—	$15.2	$15.2

ORGANIZATION AND NATURE OF OPERATIONS - Narrative (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2023 facility segment	Dec. 31, 2022 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of non-hazardous waste processing facilities	12
Number of antifreeze recycling facilities	5
Number of reportable segments \| segment	3	2

BUSINESS COMBINATIONS - Narrative (Details) - Patriot $ in Millions	Aug. 03, 2022 USD ($)
Business Acquisition [Line Items]
Consideration transferred	$ 156.9
Transaction costs	$ 1.2

BUSINESS COMBINATIONS - Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Aug. 03, 2022	Jun. 30, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Goodwill		$ 112,236	$ 112,236
Patriot Environmental Services, Inc.
Business Acquisition [Line Items]
Accounts receivable	$ 25,381
Other current assets	2,034
Property, plant, & equipment	33,968
Intangible assets	62,200
Goodwill	62,541
Accounts payable and accruals	(12,929)
Deferred tax liabilities	(16,313)
Total purchase price, net of cash acquired	156,882
Less: placed in escrow	2,780
Net cash paid	$ 154,102

BUSINESS COMBINATIONS - Schedule of Unaudited Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 18, 2022	Jun. 30, 2023	Jun. 18, 2022
Business Combination and Asset Acquisition [Abstract]
Total revenues	$ 192,166	$ 184,361	$ 385,647	$ 353,806
Net income	$ 8,642	$ 21,065	$ 25,231	$ 32,652
Net (loss) income per share: basic (in dollars per share)	$ 0.36	$ 0.90	$ 1.07	$ 1.39
Net (loss) income per share: diluted (in dollars per share)	$ 0.36	$ 0.89	$ 1.06	$ 1.38

REVENUE - Schedule of Disaggregation of Revenue by Major Lines (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 18, 2022	Jun. 30, 2023	Jun. 18, 2022
Revenue from Contract with Customer [Abstract]
Performance obligation timing			We do not have any material significant payment terms as payment is generally due within 30 days after the performance obligation has been satisfactorily completed. The Company has elected the practical expedient to recognize the incremental costs of obtaining a contract as an expense when incurred if the amortization period of the asset that we otherwise would have recognized is one year or less. In applying the guidance in Topic 606, there were no judgments or estimates made that the Company deems significant.
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 183,483	$ 150,373	$ 369,275	$ 283,762
Rental Income	8,683	6,274	16,372	12,251
Total revenues	192,166	156,647	385,647	296,013
Environmental Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	87,893	71,910	175,093	139,492
Rental Income	8,072	6,265	15,639	12,228
Total revenues	95,965	78,175	190,732	151,720
Oil Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	49,121	64,760	102,071	119,461
Rental Income	11	9	17	23
Total revenues	49,132	64,769	102,088	119,484
Industrial and Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	46,469	13,703	92,111	24,809
Rental Income	600	0	716	0
Total revenues	47,069	13,703	92,827	24,809
Parts Cleaning, Containerized Waste, & related products/services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	59,340	50,320	117,467	97,176
Parts Cleaning, Containerized Waste, & related products/services \| Environmental Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	57,885	49,217	114,543	95,340
Parts Cleaning, Containerized Waste, & related products/services \| Oil Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Parts Cleaning, Containerized Waste, & related products/services \| Industrial and Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,455	1,103	2,924	1,836
Vacuum Services & Wastewater Treatment
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	27,574	21,150
Vacuum Services & Wastewater Treatment \| Environmental Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	21,116	15,089
Vacuum Services & Wastewater Treatment \| Oil Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Vacuum Services & Wastewater Treatment \| Industrial and Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	6,458	6,061
Industrial & Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	38,556	6,539
Industrial & Field Services \| Environmental Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Industrial & Field Services \| Oil Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0
Industrial & Field Services \| Industrial and Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	38,556	6,539
Wastewater Vacuum Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers			54,343	38,541
Wastewater Vacuum Services \| Environmental Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers			41,460	28,397
Wastewater Vacuum Services \| Oil Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers			0	0
Wastewater Vacuum Services \| Industrial and Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers			12,883	10,144
Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers			76,304	12,829
Field Services \| Environmental Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers			0	0
Field Services \| Oil Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers			0	0
Field Services \| Industrial and Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers			76,304	12,829
Antifreeze Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	8,439	7,118	18,115	14,774
Antifreeze Business \| Environmental Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	8,439	7,118	18,115	14,774
Antifreeze Business \| Oil Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Antifreeze Business \| Industrial and Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Environmental Services - Other
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	453	486	975	981
Environmental Services - Other \| Environmental Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	453	486	975	981
Environmental Services - Other \| Oil Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Environmental Services - Other \| Industrial and Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Re-refinery Product Sales
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	41,820	54,198	88,629	103,337
Re-refinery Product Sales \| Environmental Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Re-refinery Product Sales \| Oil Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	41,820	54,198	88,629	103,337
Re-refinery Product Sales \| Industrial and Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Oil Collection Services & RFO
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	6,002	9,253	10,740	13,566
Oil Collection Services & RFO \| Environmental Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Oil Collection Services & RFO \| Oil Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	6,002	9,253	10,740	13,566
Oil Collection Services & RFO \| Industrial and Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Oil Filter Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,299	1,309	2,702	2,558
Oil Filter Business \| Environmental Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	0	0	0	0
Oil Filter Business \| Oil Business
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	1,299	1,309	2,702	2,558
Oil Filter Business \| Industrial and Field Services
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	$ 0	$ 0	$ 0	$ 0

REVENUE - Contract Assets and Contract Liabilities from Contracts with Customers (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Contract assets	$ 0	$ 0	$ 133,000
Contract liabilities	3,259,000	3,259,000	2,658,000
Contract liabilities - net	3,259,000	3,259,000	$ 2,525,000
Revenue recognized	$ 0	$ 2,500,000

ACCOUNTS RECEIVABLE - Summary of Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jan. 01, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade	$ 105,263	$ 111,118
Less: allowance for uncollectible accounts	5,527	4,496	$ 2,928
Trade - net	99,736	106,622
Accounts receivable - net	104,704	114,408
Other	531	1,009
Total accounts receivable - net	104,704	114,408
Related parties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable - net	4,437	6,777
Total accounts receivable - net	$ 4,437	$ 6,777

ACCOUNTS RECEIVABLE - Rollforward of Allowance (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 18, 2022	Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 4,496	$ 2,928	$ 2,928
Provision for uncollectible accounts	1,270	$ 453	2,269
Accounts written off, net of recoveries	(239)		(701)
Balance at end of period	$ 5,527		$ 4,496

INVENTORY - Carrying Value of Inventory (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 18, 2022	Jun. 30, 2023	Jun. 18, 2022	Dec. 31, 2022
Inventory Disclosure [Abstract]
Solvents and solutions	$ 11,829,000		$ 11,829,000		$ 10,792,000
Used oil and processed oil	18,991,000		18,991,000		14,904,000
Machines	7,206,000		7,206,000		6,329,000
Drums and supplies	6,543,000		6,543,000		6,476,000
Other	2,910,000		2,910,000		2,666,000
Total inventory	47,479,000		47,479,000		41,167,000
Less: machine refurbishing reserve	455,000		455,000		440,000
Total inventory - net	47,024,000		47,024,000		$ 40,727,000
Inventory write downs	$ 0	$ 0	$ 0	$ 0

GOODWILL AND OTHER INTANGIBLE ASSETS - Goodwill Balances (Details) $ in Thousands	Jun. 30, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	$ 112,236
Net book value, beginning balance	112,236
Goodwill, gross, ending balance	112,236
Net book value, ending balance	112,236
Environmental Services
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	37,650
Net book value, beginning balance	37,650
Goodwill, gross, ending balance	37,650
Net book value, ending balance	37,650
Industrial and Field Services
Goodwill [Roll Forward]
Goodwill, gross, beginning balance	74,586
Net book value, beginning balance	74,586
Goodwill, gross, ending balance	74,586
Net book value, ending balance	$ 74,586

GOODWILL AND OTHER INTANGIBLE ASSETS - Software and Other Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2021
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 139,831	$ 143,388
Accumulated Amortization	42,740	41,053
Net Carrying Amount	97,091	102,335
Customer & supplier relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	62,268	62,268
Accumulated Amortization	28,655	25,762
Net Carrying Amount	$ 33,613	36,506
Weighted Average Useful Life (years)	12 years
Permits
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 60,690	60,690
Accumulated Amortization	4,577	2,697
Net Carrying Amount	$ 56,113	57,993
Weighted Average Useful Life (years)	17 years
Software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 10,090	13,643
Accumulated Amortization	3,992	7,378
Net Carrying Amount	$ 6,098	6,265
Weighted Average Useful Life (years)	9 years
Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,413	4,421
Accumulated Amortization	3,799	3,665
Net Carrying Amount	$ 614	756
Weighted Average Useful Life (years)	5 years
Patents, formulae, and licenses
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,769	1,769
Accumulated Amortization	1,003	971
Net Carrying Amount	$ 766	798
Weighted Average Useful Life (years)	15 years
Other
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 601	597	$ (700)
Accumulated Amortization	714	580
Net Carrying Amount	$ (113)	$ 17
Weighted Average Useful Life (years)	7 years

GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 18, 2022	Jun. 30, 2023	Jun. 18, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 2.9	$ 1.4	$ 5.6	$ 2.8

GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Expected Amortization Expense (Details) $ in Millions	Jun. 30, 2023 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2023	$ 4.8
2024	8.5
2025	7.5
2026	7.0
2027	6.9
2028	$ 6.8

ACCOUNTS PAYABLE (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Accounts payable	$ 52,602	$ 55,087
Accounts payable
Related Party Transaction [Line Items]
Accounts payable	51,763	54,935
Related parties
Related Party Transaction [Line Items]
Accounts payable	$ 839	$ 152

DEBT AND FINANCING ARRANGEMENTS - Narrative (Details) - USD ($)		3 Months Ended		6 Months Ended
	Aug. 03, 2022	Jun. 30, 2023	Jun. 18, 2022	Jun. 30, 2023	Jun. 18, 2022	Dec. 31, 2022	Mar. 18, 2021
Debt Instrument [Line Items]
Weighted average interest rate		6.60%		6.60%
Interest costs incurred		$ 1,900,000	$ 300,000	$ 3,700,000	$ 500,000
Letters of credit outstanding		6,000,000		6,000,000		$ 6,000,000
Current borrowing capacity		$ 59,000,000		$ 59,000,000		$ 54,000,000
Agreement
Debt Instrument [Line Items]
Debt issuance costs	$ 100,000
Minimum interest coverage ratio	3.5
Maximum total leverage ratio	3.00
Aggregate consideration limit	$ 10,000,000
Leverage ratio at time of acquisition	3.50
Agreement \| Revolving Loan Portion
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 150,000,000						$ 100,000,000
Additional borrowings (up to)	50,000,000						50,000,000
Credit line utilized	$ 115,000,000
Agreement \| Revolving Loan Portion \| Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Agreement \| Revolving Loan Portion \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Agreement \| Revolving Loan Portion \| Secured Overnight Financing Rate (SOFR) \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Agreement \| Revolving Loan Portion \| Secured Overnight Financing Rate (SOFR) \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Agreement \| Revolving Loan Portion \| Bank of America's Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Agreement \| Swing Line loan
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 15,000,000

DEBT AND FINANCING ARRANGEMENTS - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
Long-term debt	$ 85,000	$ 90,000
Less: unamortized debt issuance costs	521	617
Long-term debt - net	$ 84,479	$ 89,383

SEGMENT INFORMATION - Operating Segment Results (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 18, 2022 USD ($)	Jun. 30, 2023 USD ($) segment	Jun. 18, 2022 USD ($)	Dec. 31, 2022 segment
Segment Reporting [Abstract]
Number of reportable segments \| segment			3		2
Revenues
Revenues	$ 183,483	$ 150,373	$ 369,275	$ 283,762
Rental income	8,683	6,274	16,372	12,251
Total revenues	192,166	156,647	385,647	296,013
Operating expenses
Operating costs	146,387	104,755	286,448	206,538
Operating depreciation and amortization	8,714	5,317	17,896	10,290
Profit before corporate selling, general, and administrative expenses	37,065	46,575	81,303	79,185
Selling, general, and administrative expenses	20,361	15,024	38,061	28,759
Depreciation and amortization from SG&A	3,088	1,460	6,073	2,995
Total selling, general, and administrative expenses	23,449	16,484	44,134	31,754
Other (income) - net	(265)	1,001	(734)	791
Operating income	13,881	29,090	37,903	46,640
Interest expense – net	1,929	250	3,743	473
Income before income taxes	11,952	28,840	34,160	46,167
Environmental Services
Revenues
Revenues	87,893	71,910	175,093	139,492
Rental income	8,072	6,265	15,639	12,228
Total revenues	95,965	78,175	190,732	151,720
Oil Business
Revenues
Revenues	49,121	64,760	102,071	119,461
Rental income	11	9	17	23
Total revenues	49,132	64,769	102,088	119,484
Industrial and Field Services
Revenues
Revenues	46,469	13,703	92,111	24,809
Rental income	600	0	716	0
Total revenues	47,069	13,703	92,827	24,809
Service revenues
Revenues
Revenues	121,342	75,584	240,794	144,500
Product revenues
Revenues
Revenues	62,141	74,789	128,481	139,262
Segments \| Environmental Services
Revenues
Rental income	8,072	6,265	15,639	12,228
Total revenues	95,965	78,175	190,732	151,720
Operating expenses
Operating costs	68,459	56,812	136,999	114,837
Operating depreciation and amortization	3,641	2,769	7,140	5,236
Profit before corporate selling, general, and administrative expenses	23,865	18,594	46,593	31,647
Segments \| Oil Business
Revenues
Rental income		9	17	23
Total revenues	49,132	64,769	102,088	119,484
Operating expenses
Operating costs	40,781	35,841	77,079	70,006
Operating depreciation and amortization	2,675	2,125	5,280	4,209
Profit before corporate selling, general, and administrative expenses	5,676	26,803	19,729	45,269
Segments \| Industrial and Field Services
Revenues
Rental income	600	0	716	0
Total revenues	47,069	13,703	92,827	24,809
Operating expenses
Operating costs	37,147	12,102	72,370	21,695
Operating depreciation and amortization	2,398	423	5,476	845
Profit before corporate selling, general, and administrative expenses	7,524	1,178	14,981	2,269
Segments \| Service revenues \| Environmental Services
Revenues
Revenues	72,018	59,277	143,018	114,479
Segments \| Service revenues \| Oil Business
Revenues
Revenues	2,855	2,604	5,665	5,212
Segments \| Service revenues \| Industrial and Field Services
Revenues
Revenues	46,469	13,703	92,111	24,809
Segments \| Product revenues \| Environmental Services
Revenues
Revenues	15,875	12,633	32,075	25,013
Segments \| Product revenues \| Oil Business
Revenues
Revenues	46,266	62,156	96,406	114,249
Segments \| Product revenues \| Industrial and Field Services
Revenues
Revenues	0	0	0	0
Corporate and Eliminations
Revenues
Rental income	0	0	0	0
Total revenues	0	0	0	0
Operating expenses
Operating costs	0	0	0	0
Operating depreciation and amortization	0	0	0	0
Profit before corporate selling, general, and administrative expenses	0	0	0	0
Selling, general, and administrative expenses	20,361	15,024	38,061	28,759
Depreciation and amortization from SG&A	3,088	1,460	6,073	2,995
Total selling, general, and administrative expenses	23,449	16,484	44,134	31,754
Other (income) - net	(265)	1,001	(734)	791
Interest expense – net	1,929	250	3,743	473
Corporate and Eliminations \| Service revenues
Revenues
Revenues	0	0	0	0
Corporate and Eliminations \| Product revenues
Revenues
Revenues	$ 0	$ 0	0	0
Intersegment revenue
Revenues
Total revenues			$ 5,200	$ 3,900

SEGMENT INFORMATION - Assets by Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Assets	$ 812,791	$ 794,241
Segments \| Environmental Services
Segment Reporting Information [Line Items]
Assets	258,031	253,906
Segments \| Oil Business
Segment Reporting Information [Line Items]
Assets	186,153	190,862
Segments \| Industrial and Field Services
Segment Reporting Information [Line Items]
Assets	290,210	283,683
Unallocated Corporate Assets
Segment Reporting Information [Line Items]
Assets	$ 78,397	$ 65,790

COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Lease renewal term	5 years
Remaining amount committed	$ 21.3	$ 20.7
Loss contingency accrual	$ 3.1	$ 3.2
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 month
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	11 years

COMMITMENTS AND CONTINGENCIES - Rental Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 18, 2022	Jun. 30, 2023	Jun. 18, 2022
Lessor, Lease, Description [Line Items]
Rental income	$ 8,683	$ 6,274	$ 16,372	$ 12,251
Environmental Services
Lessor, Lease, Description [Line Items]
Rental income	8,072	6,265	15,639	12,228
Oil Business
Lessor, Lease, Description [Line Items]
Rental income	11	9	17	23
Industrial and Field Services
Lessor, Lease, Description [Line Items]
Rental income	600	0	716	0
Parts Cleaning
Lessor, Lease, Description [Line Items]
Rental income	8,568	6,233	16,234	12,172
Parts Cleaning \| Environmental Services
Lessor, Lease, Description [Line Items]
Rental income	7,968	6,233	15,518	12,172
Parts Cleaning \| Oil Business
Lessor, Lease, Description [Line Items]
Rental income	0	0	0	0
Parts Cleaning \| Industrial and Field Services
Lessor, Lease, Description [Line Items]
Rental income	600	0	716	0
Property
Lessor, Lease, Description [Line Items]
Rental income	115	41	138	79
Property \| Environmental Services
Lessor, Lease, Description [Line Items]
Rental income	104	32	121	56
Property \| Oil Business
Lessor, Lease, Description [Line Items]
Rental income	11	9	17	23
Property \| Industrial and Field Services
Lessor, Lease, Description [Line Items]
Rental income	$ 0	$ 0	$ 0	$ 0

INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
INCOME TAXES (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 18, 2022	Jun. 30, 2023	Jun. 18, 2022
Valuation Allowance [Line Items]
Provision for income taxes	$ 3,310	$ 7,733	$ 8,929	$ 12,182
Effective income tax rate, percent	27.70%	27.00%	26.10%	26.40%
Uncertain tax positions
Valuation Allowance [Line Items]
Valuation allowance	$ 2,200		$ 2,200
Foreign Net Operating Loss Carryforwards
Valuation Allowance [Line Items]
Valuation allowance	$ 700		$ 700

SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)				3 Months Ended	6 Months Ended
	Nov. 14, 2022	Sep. 21, 2022	Feb. 01, 2021	Jun. 30, 2023	Jun. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)					80,298
Share price			$ 21.77
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense				$ 6,300,000	$ 6,300,000
Weighted-average vesting period					1 year 8 months 12 days
Restricted stock \| Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)					1 year
Restricted stock \| Members of Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)					3 years
Restricted stock \| Members of Management \| Special Incentive Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		3 years
Grants in period (in shares)	147,623
Shares expected to vest (in shares)	147,623
Performance-based vesting percentage	66.667%
Restricted stock \| Members of Management \| Special Incentive Program \| Vesting period one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.333%
Restricted stock \| Members of Management \| Special Incentive Program \| Vesting period two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.333%
Restricted stock \| Members of Management \| Special Incentive Program \| Vesting period three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.333%
Restricted stock \| Mr. Recatto
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)			500,000
Vesting threshold (in dollars per share)			$ 5.00
Shares vested upon achievement of share price threshold (in shares)			0
Compensation expense					$ 100,000
Risk-free rate			0.29%
Expected dividend yield			0.00%
Expected volatility rate			53.07%
Restricted stock \| Mr. Recatto \| Vesting period one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					0.00%
Restricted stock \| Mr. Recatto \| Vesting period two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)					90 days
Vesting percentage					25.00%
Grant of restricted stock			$ 500,000
Restricted stock \| Mr. Recatto \| Vesting period three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					50.00%
Restricted stock \| Mr. Recatto \| Provision for possible accelerated vesting of award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)					180 days
Vesting percentage					50.00%
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Time Based Restricted Stock \| Mr. Recatto
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)			90 days
Compensation expense				200,000
Unrecognized compensation expense				$ 1,300,000	$ 1,300,000

SHARE-BASED COMPENSATION - Restricted Stock Compensation/Awards (Details) - Restricted stock - USD ($) $ in Thousands	1 Months Ended								6 Months Ended
	May 30, 2023	Feb. 28, 2023	Nov. 30, 2022	Apr. 30, 2022	Feb. 28, 2022	Feb. 28, 2021	Feb. 29, 2020	Apr. 30, 2018	Jun. 30, 2023	Jun. 18, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense									$ 6,300
April, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)								350,000
Compensation Expense									0	$ 380
Unrecognized Expense									0	0
February, 2020 \| Members of Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)							41,138
Compensation Expense									0	40
Unrecognized Expense									0	47
February, 2021 \| Members of Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)						35,898
Compensation Expense									104	103
Unrecognized Expense									103	345
February, 2021 \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)						500,000
Compensation Expense									502	1,067
Unrecognized Expense									1,334	2,814
February, 2022 \| Members of Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)					75,355
Compensation Expense									249	245
Unrecognized Expense									735	1,303
April, 2022 \| Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)				17,082
Compensation Expense									0	234
Unrecognized Expense									0	246
February, 2023 \| Members of Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)		66,024
Compensation Expense									310	248
Unrecognized Expense									1,552	0
November, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)			147,623
Compensation Expense									524	0
Unrecognized Expense									2,339	0
May 2023 Member \| Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted (in shares)	14,274
Compensation Expense									280	0
Unrecognized Expense									$ 200	$ 0

SHARE-BASED COMPENSATION - Restricted Stock Vesting Schedule by Percentage (Details)	6 Months Ended
	Jun. 30, 2023 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares) \| shares	99,487
Mr. Recatto \| Restricted stock \| Less than $5 per share increase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in stock price from employment commencement date (in dollars per share) \| $ / shares	$ 5
Total Percentage of Restricted Stock Shares to Be Vested	0.00%
Mr. Recatto \| Restricted stock \| $5 per share increase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in stock price from employment commencement date (in dollars per share) \| $ / shares	$ 5
Total Percentage of Restricted Stock Shares to Be Vested	25.00%
Vested (in shares) \| shares	125,000
Mr. Recatto \| Restricted stock \| $10 per share increase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in stock price from employment commencement date (in dollars per share) \| $ / shares	$ 10
Total Percentage of Restricted Stock Shares to Be Vested	50.00%
Vested (in shares) \| shares	250,000
Mr. Recatto \| Restricted stock \| $15 per share increase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in stock price from employment commencement date (in dollars per share) \| $ / shares	$ 15
Total Percentage of Restricted Stock Shares to Be Vested	75.00%
Vested (in shares) \| shares	375,000
Mr. Recatto \| Restricted stock \| $20 or more per share increase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in stock price from employment commencement date (in dollars per share) \| $ / shares	$ 20
Total Percentage of Restricted Stock Shares to Be Vested	100.00%
Vested (in shares) \| shares	500,000

SHARE-BASED COMPENSATION - Restricted Stock Rollforward (Details)	6 Months Ended
	Jun. 30, 2023 $ / shares shares
Number of Shares
Nonvested shares outstanding at Beginning of Period (in shares) \| shares	728,693
Grants in period (in shares) \| shares	80,298
Vested (in shares) \| shares	(99,487)
Forfeited (in shares) \| shares	(28,797)
Nonvested shares outstanding at End of Period (in shares) \| shares	680,707
Weighted Average Grant-Date Fair Value Per Share
Nonvested shares outstanding at Beginning of Period (in dollars per share) \| $ / shares	$ 21.83
Granted (in dollars per share) \| $ / shares	37.08
Vested (in dollars per share) \| $ / shares	25.51
Forfeited (in dollars per share) \| $ / shares	21.95
Nonvested shares outstanding at End of Period (in dollars per share) \| $ / shares	$ 25.79

SHARE-BASED COMPENSATION - Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan - Employee stock	3 Months Ended
	Jun. 30, 2023 $ / shares shares
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares available employee stock purchase plan (in shares)	31,438
Issuance of common stock – ESPP (in shares)	5,070
Weighted average fair value per share ESPP (in dollars per share) \| $ / shares	$ 35.24

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 18, 2022	Jun. 30, 2023	Jun. 18, 2022
Earnings Per Share [Abstract]
Net income	$ 8,642	$ 21,107	$ 25,231	$ 33,985
Weighted average basic shares outstanding (in shares)	23,681	23,489	23,665	23,482
Dilutive shares for share–based compensation plans (in shares)	250	155	233	158
Weighted average diluted shares outstanding (in shares)	23,931	23,644	23,898	23,640
Net income per share: basic (in dollars per share)	$ 0.36	$ 0.90	$ 1.07	$ 1.45
Net income per share: diluted (in dollars per share)	$ 0.36	$ 0.89	$ 1.06	$ 1.44

FAIR VALUE MEASUREMENTS - Assets Measured on Recurring Basis (Details) - Recurring $ in Millions	Jun. 30, 2023 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments at fair value	$ 15.2
Quoted prices in active markets (Level 1)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments at fair value	0.0
Significant other observable inputs (Level 2)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments at fair value	0.0
Significant unobservable inputs (Level 3)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments at fair value	15.2
Significant unobservable inputs (Level 3) \| Retriev
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investments at fair value	$ 3.0

SUBSEQUENT EVENTS (Details) - Heritage-Crystal Clean, Inc - Subsequent event - JFL-Tiger Acquisition Co.Inc	Jul. 19, 2023 USD ($) $ / shares
Subsequent Event [Line Items]
Share price (in dollars per share) \| $ / shares	$ 45.50
Adoption voting percent	75.00%
Termination fee	$ 42,331,515
Superior proposal termination fee	23,584,701
Parent Termination Fee	$ 72,568,311

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