GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes to goodwill

The changes in goodwill by segment for the six months ended June 30, 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	7,311			5,225			12,536
Measurement period adjustments from prior period acquisitions	(2,611		)	(1,421		)	(4,032		)
Foreign currency translation	1,089			1,262			2,351
Balance at June 30, 2019	$	212,808		$	312,236		$	525,044

Summary of indefinite-lived intangible assets

As of June 30, 2019 and December 31, 2018, the Company's total intangible assets consisted of the following (in thousands):

	June 30, 2019						December 31, 2018
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	182,063	$	83,278	$	98,785	$	177,583	$	79,358	$	98,225
Customer and supplier relationships	401,296		195,036		206,260		393,487		179,824		213,663
Other intangible assets	38,198		32,266		5,932		37,262		29,743		7,519
Total amortizable permits and other intangible assets	621,557		310,580		310,977		608,332		288,925		319,407
Trademarks and trade names	122,876		—		122,876		122,468		—		122,468
Total permits and other intangible assets	$	744,433	$	310,580	$	433,853	$	730,800	$	288,925	$	441,875

Schedule of finite-lived intangible assets

As of June 30, 2019 and December 31, 2018, the Company's total intangible assets consisted of the following (in thousands):

	June 30, 2019						December 31, 2018
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	$	182,063	$	83,278	$	98,785	$	177,583	$	79,358	$	98,225
Customer and supplier relationships	401,296		195,036		206,260		393,487		179,824		213,663
Other intangible assets	38,198		32,266		5,932		37,262		29,743		7,519
Total amortizable permits and other intangible assets	621,557		310,580		310,977		608,332		288,925		319,407
Trademarks and trade names	122,876		—		122,876		122,468		—		122,468
Total permits and other intangible assets	$	744,433	$	310,580	$	433,853	$	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 June 30, 2019 was as follows (in thousands):

Years Ending December 31,	Expected Amortization
2019 (six months)	$	16,748
2020	31,943
2021	28,661
2022	28,231
2023	24,090
Thereafter	181,304
	$	310,977