GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

3 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes to goodwill

The changes in goodwill by segment for the three months ended March 31, 2020 were as follows (in thousands):

	Environmental Services			Safety-Kleen			Totals
Balance at January 1, 2020	$	212,531		$	312,482		$	525,013
Measurement period adjustments from prior period acquisitions	54			—			54
Decrease from disposition of businesses	(649		)	—			(649		)
Foreign currency translation	(2,223		)	(2,568		)	(4,791		)
Balance at March 31, 2020	$	209,713		$	309,914		$	519,627

Summary of indefinite-lived intangible assets

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

	March 31, 2020						December 31, 2019
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	181,095	$	87,790	$	93,305	$	184,235	$	87,228	$	97,007
Customer and supplier relationships	386,197		199,915		186,282		401,696		207,884		193,812
Other intangible assets	36,632		31,435		5,197		38,331		33,018		5,313
Total amortizable permits and other intangible assets	603,924		319,140		284,784		624,262		328,130		296,132
Trademarks and trade names	122,097		—		122,097		122,934		—		122,934
Total permits and other intangible assets	$	726,021	$	319,140	$	406,881	$	747,196	$	328,130	$	419,066

Schedule of finite-lived intangible assets

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

	March 31, 2020						December 31, 2019
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	181,095	$	87,790	$	93,305	$	184,235	$	87,228	$	97,007
Customer and supplier relationships	386,197		199,915		186,282		401,696		207,884		193,812
Other intangible assets	36,632		31,435		5,197		38,331		33,018		5,313
Total amortizable permits and other intangible assets	603,924		319,140		284,784		624,262		328,130		296,132
Trademarks and trade names	122,097		—		122,097		122,934		—		122,934
Total permits and other intangible assets	$	726,021	$	319,140	$	406,881	$	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 March 31, 2020 was as follows (in thousands):

Years Ending December 31,	Expected Amortization
2020 (nine months)	$	24,393
2021	29,683
2022	29,429
2023	25,245
2024	23,783
Thereafter	152,251
	$	284,784