GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes to Goodwill

The changes in goodwill by segment for the six months ended June 30, 2020 were as follows (in thousands):

	Environmental Services		Safety-Kleen		Totals
Balance at January 1, 2020	$	212,531	$	312,482	$	525,013
Increase from current period acquisition	—		1,487		1,487
Measurement period adjustments from prior period acquisitions	23		—		23
Decrease from disposition of businesses	(674)		—		(674)
Foreign currency translation	(1,263)		(1,432)		(2,695)
Balance at June 30, 2020	$	210,617	$	312,537	$	523,154

Summary of Indefinite-Lived Intangible Assets

As of June 30, 2020 and December 31, 2019, the Company's intangible assets consisted of the following (in thousands):

	June 30, 2020						December 31, 2019
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	182,689	$	90,360	$	92,329	$	184,235	$	87,228	$	97,007
Customer and supplier relationships	388,341		207,604		180,737		401,696		207,884		193,812
Other intangible assets	37,480		32,561		4,919		38,331		33,018		5,313
Total amortizable permits and other intangible assets	608,510		330,525		277,985		624,262		328,130		296,132
Trademarks and trade names	122,463		—		122,463		122,934		—		122,934
Total permits and other intangible assets	$	730,973	$	330,525	$	400,448	$	747,196	$	328,130	$	419,066

Schedule of Finite-Lived Intangible Assets

As of June 30, 2020 and December 31, 2019, the Company's intangible assets consisted of the following (in thousands):

	June 30, 2020						December 31, 2019
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	182,689	$	90,360	$	92,329	$	184,235	$	87,228	$	97,007
Customer and supplier relationships	388,341		207,604		180,737		401,696		207,884		193,812
Other intangible assets	37,480		32,561		4,919		38,331		33,018		5,313
Total amortizable permits and other intangible assets	608,510		330,525		277,985		624,262		328,130		296,132
Trademarks and trade names	122,463		—		122,463		122,934		—		122,934
Total permits and other intangible assets	$	730,973	$	330,525	$	400,448	$	747,196	$	328,130	$	419,066

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, 2020 was as follows (in thousands):

Years Ending December 31,	Expected Amortization
2020 (six months)	$	16,038
2021	29,858
2022	29,594
2023	25,391
2024	23,919
Thereafter	153,185
	$	277,985