GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in goodwill by segment for the three months ended March 31, 2018 were as follows (in thousands):



	Environmental Services			Safety-Kleen			Totals
Balance at January 1, 2018	$	172,386		$	306,137		$	478,523
Increase from current period acquisition	15,908			—			15,908
Measurement period adjustments from prior period acquisitions	(9		)	—			(9		)
Foreign currency translation	(795		)	(922		)	(1,717		)
Balance at March 31, 2018	$	187,490		$	305,215		$	492,705

Summary of indefinite-lived intangible assets

As of March 31, 2018 and December 31, 2017, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):



	March 31, 2018						December 31, 2017
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	174,867	$	75,493	$	99,374	$	174,721	$	74,347	$	100,374
Customer and supplier relationships	400,385		165,056		235,329		399,224		158,972		240,252
Other intangible assets	38,071		31,170		6,901		36,766		31,592		5,174
Total amortizable permits and other intangible assets	613,323		271,719		341,604		610,711		264,911		345,800
Indefinite lived trademarks and trade names	123,031		—		123,031		123,328		—		123,328
Total permits and other intangible assets	$	736,354	$	271,719	$	464,635	$	734,039	$	264,911	$	469,128

Schedule of finite-lived intangible assets

As of March 31, 2018 and December 31, 2017, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):



	March 31, 2018						December 31, 2017
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	174,867	$	75,493	$	99,374	$	174,721	$	74,347	$	100,374
Customer and supplier relationships	400,385		165,056		235,329		399,224		158,972		240,252
Other intangible assets	38,071		31,170		6,901		36,766		31,592		5,174
Total amortizable permits and other intangible assets	613,323		271,719		341,604		610,711		264,911		345,800
Indefinite lived trademarks and trade names	123,031		—		123,031		123,328		—		123,328
Total permits and other intangible assets	$	736,354	$	271,719	$	464,635	$	734,039	$	264,911	$	469,128

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, 2018 was as follows (in thousands):



Years Ending December 31,	Expected Amortization
2018 (nine months)	$	26,018
2019	32,247
2020	29,486
2021	27,492
2022	27,342
Thereafter	199,019
	$	341,604