GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes to Goodwill

The changes in goodwill by segment for the six months ended June 30, 2022 were as follows (in thousands):

	Environmental Services		Safety-Kleen Sustainability Solutions		Totals
Balance at January 1, 2022	$	1,085,534	$	141,508	$	1,227,042
Increase from current period acquisition	—		29,375		29,375
Measurement period adjustments from prior period acquisition	(6,453)		—		(6,453)
Decrease from disposition of business	(4,412)		—		(4,412)
Foreign currency translation	(659)		(238)		(897)
Balance at June 30, 2022	$	1,074,010	$	170,645	$	1,244,655

Schedule of Finite-Lived Intangible Assets

As of June 30, 2022 and December 31, 2021, the Company's intangible assets consisted of the following (in thousands):

	June 30, 2022						December 31, 2021
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	189,675	$	105,957	$	83,718	$	187,519	$	102,408	$	85,111
Customer and supplier relationships	589,192		229,277		359,915		576,474		214,776		361,698
Other intangible assets	95,688		25,100		70,588		94,271		19,359		74,912
Total amortizable permits and other intangible assets	874,555		360,334		514,221		858,264		336,543		521,721
Trademarks and trade names	123,033		—		123,033		123,191		—		123,191
Total permits and other intangible assets	$	997,588	$	360,334	$	637,254	$	981,455	$	336,543	$	644,912

Summary of Indefinite-Lived Intangible Assets

As of June 30, 2022 and December 31, 2021, the Company's intangible assets consisted of the following (in thousands):

	June 30, 2022						December 31, 2021
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	189,675	$	105,957	$	83,718	$	187,519	$	102,408	$	85,111
Customer and supplier relationships	589,192		229,277		359,915		576,474		214,776		361,698
Other intangible assets	95,688		25,100		70,588		94,271		19,359		74,912
Total amortizable permits and other intangible assets	874,555		360,334		514,221		858,264		336,543		521,721
Trademarks and trade names	123,033		—		123,033		123,191		—		123,191
Total permits and other intangible assets	$	997,588	$	360,334	$	637,254	$	981,455	$	336,543	$	644,912

Schedule of Expected Amortization for the Net Carrying Amount of Finite Lived Intangible Assets

The expected amortization of the net carrying amount of finite-lived intangible assets at June 30, 2022 was as follows (in thousands):

Years Ending December 31,	Expected Amortization
2022 (six months)	$	24,966
2023	45,728
2024	40,256
2025	39,051
2026	37,167
Thereafter	327,053
	$	514,221