SEGMENT REPORTING (Tables)

6 Months Ended

Jun. 30, 2023

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, 2023 and 2022 (in thousands):

	For the Three Months Ended						For the Three Months Ended
	June 30, 2023						June 30, 2022
	Third-Party Revenues		Intersegment Revenues (Expenses), net		Direct Revenues		Third-Party Revenues		Intersegment Revenues (Expenses), net		Direct Revenues
Environmental Services	$	1,161,482	$	10,554	$	1,172,036	$	1,084,506	$	6,237	$	1,090,743
Safety-Kleen Sustainability Solutions	236,302		(10,554)		225,748		271,727		(6,237)		265,490
Corporate Items	116		—		116		79		—		79
Total	$	1,397,900	$	—	$	1,397,900	$	1,356,312	$	—	$	1,356,312

	For the Six Months Ended						For the Six Months Ended
	June 30, 2023						June 30, 2022
	Third-Party Revenues		Intersegment Revenues (Expenses), net		Direct Revenues		Third-Party Revenues		Intersegment Revenues (Expenses), net		Direct Revenues
Environmental Services	$	2,222,464	$	20,313	$	2,242,777	$	2,025,304	$	12,884	$	2,038,188
Safety-Kleen Sustainability Solutions	482,600		(20,313)		462,287		499,966		(12,884)		487,082
Corporate Items	223		—		223		151		—		151
Total	$	2,705,287	$	—	$	2,705,287	$	2,525,421	$	—	$	2,525,421

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):

	For the Three Months Ended				For the Six Months Ended
	June 30,				June 30,
	2023		2022		2023		2022
Adjusted EBITDA:
Environmental Services	$	305,622	$	269,341	$	533,967	$	452,943
Safety-Kleen Sustainability Solutions	53,415		97,010		94,878		148,887
Corporate Items	(71,531)		(57,281)		(126,201)		(112,501)
Total	287,506		309,070		502,644		489,329
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	3,486		3,197		6,893		6,353
Stock-based compensation	4,500		6,835		10,518		12,547
Depreciation and amortization	89,697		87,868		174,455		172,166
Income from operations	189,823		211,170		310,778		298,263
Other expense (income), net	1,283		(1,265)		1,167		(1,969)
Loss on early extinguishment of debt	—		—		2,362		—
Gain on sale of business	—		(8,864)		—		(8,864)
Interest expense, net of interest income	30,072		26,256		50,704		51,273
Income before provision for income taxes	$	158,468	$	195,043	$	256,545	$	257,823