GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

9 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in goodwill by segment for the nine months ended September 30, 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 acquisitions	33,281			4,168			37,449
Measurement period adjustments from prior period acquisitions	(78		)	—			(78		)
Foreign currency translation	(829		)	(963		)	(1,792		)
Balance at September 30, 2018	$	204,760		$	309,342		$	514,102

Summary of indefinite-lived intangible assets

As of September 30, 2018 and December 31, 2017, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):



	September 30, 2018						December 31, 2017
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	177,628	$	78,419	$	99,209	$	174,721	$	74,347	$	100,374
Customer and supplier relationships	400,292		178,506		221,786		399,224		158,972		240,252
Other intangible assets	37,844		31,412		6,432		36,766		31,592		5,174
Total amortizable permits and other intangible assets	615,764		288,337		327,427		610,711		264,911		345,800
Indefinite lived trademarks and trade names	123,928		—		123,928		123,328		—		123,328
Total permits and other intangible assets	$	739,692	$	288,337	$	451,355	$	734,039	$	264,911	$	469,128

Schedule of finite-lived intangible assets

As of September 30, 2018 and December 31, 2017, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):



	September 30, 2018						December 31, 2017
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	177,628	$	78,419	$	99,209	$	174,721	$	74,347	$	100,374
Customer and supplier relationships	400,292		178,506		221,786		399,224		158,972		240,252
Other intangible assets	37,844		31,412		6,432		36,766		31,592		5,174
Total amortizable permits and other intangible assets	615,764		288,337		327,427		610,711		264,911		345,800
Indefinite lived trademarks and trade names	123,928		—		123,928		123,328		—		123,328
Total permits and other intangible assets	$	739,692	$	288,337	$	451,355	$	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 September 30, 2018 was as follows (in thousands):



Years Ending December 31,	Expected Amortization
2018 (three months)	$	8,481
2019	32,488
2020	30,137
2021	27,645
2022	27,476
Thereafter	201,200
	$	327,427