GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

3 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes to goodwill

The changes in goodwill by segment for the three months ended March 31, 2019 were as follows (in thousands):

	Environmental Services			Safety-Kleen			Totals
Balance at January 1, 2019	$	207,019		$	307,170		$	514,189
Increase from current period acquisitions	—			6,825			6,825
Measurement period adjustments from prior period acquisitions	(2,571		)	(1,422		)	(3,993		)
Foreign currency translation	412			477			889
Balance at March 31, 2019	$	204,860		$	313,050		$	517,910

Summary of indefinite-lived intangible assets

As of March 31, 2019 and December 31, 2018, the Company's total intangible assets consisted of the following (in thousands):

	March 31, 2019						December 31, 2018
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	180,463	$	81,135	$	99,328	$	177,583	$	79,358	$	98,225
Customer and supplier relationships	397,949		187,195		210,754		393,487		179,824		213,663
Other intangible assets	37,616		31,363		6,253		37,262		29,743		7,519
Total amortizable permits and other intangible assets	616,028		299,693		316,335		608,332		288,925		319,407
Trademarks and trade names	122,623		—		122,623		122,468		—		122,468
Total permits and other intangible assets	$	738,651	$	299,693	$	438,958	$	730,800	$	288,925	$	441,875

Schedule of finite-lived intangible assets

As of March 31, 2019 and December 31, 2018, the Company's total intangible assets consisted of the following (in thousands):

	March 31, 2019						December 31, 2018
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	180,463	$	81,135	$	99,328	$	177,583	$	79,358	$	98,225
Customer and supplier relationships	397,949		187,195		210,754		393,487		179,824		213,663
Other intangible assets	37,616		31,363		6,253		37,262		29,743		7,519
Total amortizable permits and other intangible assets	616,028		299,693		316,335		608,332		288,925		319,407
Trademarks and trade names	122,623		—		122,623		122,468		—		122,468
Total permits and other intangible assets	$	738,651	$	299,693	$	438,958	$	730,800	$	288,925	$	441,875

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, 2019 was as follows (in thousands):

Years Ending December 31,	Expected Amortization
2019 (nine months)	$	24,947
2020	31,289
2021	28,020
2022	27,849
2023	23,862
Thereafter	180,368
	$	316,335