SEGMENT REPORTING (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 2024 and 2023 (in thousands):

	Three Months Ended						Three Months Ended
	March 31, 2024						March 31, 2023
	Third-Party Revenues		Intersegment Revenues (Expenses), net		Direct Revenues		Third-Party Revenues		Intersegment Revenues (Expenses), net		Direct Revenues
Environmental Services	$	1,161,279	$	11,231	$	1,172,510	$	1,060,982	$	9,759	$	1,070,741
Safety-Kleen Sustainability Solutions	215,314		(11,231)		204,083		246,298		(9,759)		236,539
Corporate Items	102		—		102		107		—		107
Total	$	1,376,695	$	—	$	1,376,695	$	1,307,387	$	—	$	1,307,387

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
	March 31,
	2024		2023
Adjusted EBITDA:
Environmental Services	$	264,475	$	228,345
Safety-Kleen Sustainability Solutions	29,700		41,463
Corporate Items	(64,080)		(54,670)
Total	230,095		215,138
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	3,217		3,407
Stock-based compensation	6,338		6,018
Depreciation and amortization	95,065		84,758
Income from operations	125,475		120,955
Other expense (income), net	1,141		(116)
Loss on early extinguishment of debt	—		2,362
Interest expense, net of interest income	28,539		20,632
Income before provision for income taxes	$	95,795	$	98,077