SEGMENT REPORTING (Tables)

6 Months Ended

Jun. 30, 2024

Segment Reporting [Abstract]

Schedule of Reconciliation of Third Party Revenues to Direct Revenues

The following tables reconcile third-party revenues to direct revenues for the three and six months ended June 30, 2024 and 2023 (in thousands):

	Three Months Ended						Three Months Ended
	June 30, 2024						June 30, 2023
	Third-Party Revenues		Intersegment Revenues (Expenses), net		Direct Revenues		Third-Party Revenues		Intersegment Revenues (Expenses), net		Direct Revenues
Environmental Services	$	1,297,298	$	12,085	$	1,309,383	$	1,161,482	$	10,554	$	1,172,036
Safety-Kleen Sustainability Solutions	255,322		(12,085)		243,237		236,302		(10,554)		225,748
Corporate Items	99		—		99		116		—		116
Total	$	1,552,719	$	—	$	1,552,719	$	1,397,900	$	—	$	1,397,900

	Six Months Ended						Six Months Ended
	June 30, 2024						June 30, 2023
	Third-Party Revenues		Intersegment Revenues (Expenses), net		Direct Revenues		Third-Party Revenues		Intersegment Revenues (Expenses), net		Direct Revenues
Environmental Services	$	2,458,577	$	23,316	$	2,481,893	$	2,222,464	$	20,313	$	2,242,777
Safety-Kleen Sustainability Solutions	470,636		(23,316)		447,320		482,600		(20,313)		462,287
Corporate Items	201		—		201		223		—		223
Total	$	2,929,414	$	—	$	2,929,414	$	2,705,287	$	—	$	2,705,287

Schedule of Reconciliation to Consolidated Statements of Income to Adjusted EBITDA

The following table presents Adjusted EBITDA information used by management by reported segment (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2024		2023		2024		2023
Adjusted EBITDA:
Environmental Services	$	359,915	$	305,622	$	624,390	$	533,967
Safety-Kleen Sustainability Solutions	51,476		53,415		81,176		94,878
Corporate Items	(83,575)		(71,531)		(147,655)		(126,201)
Total	327,816		287,506		557,911		502,644
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	3,304		3,486		6,521		6,893
Stock-based compensation	8,515		4,500		14,853		10,518
Depreciation and amortization	100,504		89,697		195,569		174,455
Income from operations	215,493		189,823		340,968		310,778
Other expense, net	167		1,283		1,308		1,167
Loss on early extinguishment of debt	—		—		—		2,362
Interest expense, net of interest income	36,449		30,072		64,988		50,704
Income before provision for income taxes	$	178,877	$	158,468	$	274,672	$	256,545