SEGMENT REPORTING (Tables)

3 Months Ended

Mar. 31, 2022

Segment Reporting [Abstract]

Reconciliation of Third Party Revenues to Direct Revenues

The following table reconciles third-party revenues to direct revenues for the three months ended March 31, 2022 and 2021 (in thousands):

	For the Three Months Ended March 31, 2022						For the Three Months Ended March 31, 2021
	Third-party revenues		Intersegment revenues, net		Direct revenues		Third-party revenues		Intersegment revenues, net		Direct revenues
Environmental Services	$	940,798	$	6,647	$	947,445	$	652,878	$	1,724	$	654,602
Safety-Kleen Sustainability Solutions	228,239		(6,647)		221,592		155,191		(1,724)		153,467
Corporate Items	72		—		72		79		—		79
Total	$	1,169,109	$	—	$	1,169,109	$	808,148	$	—	$	808,148

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
	March 31,
	2022		2021
Adjusted EBITDA:
Environmental Services	$	183,602	$	140,254
Safety-Kleen Sustainability Solutions	51,877		31,632
Corporate Items	(55,220)		(42,435)
Total	180,259		129,451
Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	3,156		2,953
Stock-based compensation	5,712		3,480
Depreciation and amortization	84,298		72,163
Income from operations	87,093		50,855
Other (income) expense, net	(704)		1,228
Interest expense, net of interest income	25,017		17,918
Income before provision for income taxes	$	62,780	$	31,709