GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in goodwill by segment for the six months ended June 30, 2017 were as follows (in thousands):



	Technical Services			Industrial & Field Services		Safety-Kleen		Oil, Gas and Lodging Services		Totals
Balance at January 1, 2017	$	61,116		$	107,968	$	296,070	$	—	$	465,154
Increase from current period acquisitions	—			—		4,916		—		4,916
Measurement period adjustments from prior period acquisitions	—			—		2,186		—		2,186
Decrease from disposition of business	(1,300		)	—		—				(1,300		)
Foreign currency translation and other	157			615		1,091		—		1,863
Balance at June 30, 2017	$	59,973		$	108,583	$	304,263	$	—	$	472,819

Summary of indefinite-lived intangible assets

As of June 30, 2017 and December 31, 2016, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):



	June 30, 2017							December 31, 2016
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	173,174	$	70,698	$	102,476	21.4	$	171,637	$	67,301	$	104,336	18.9
Customer and supplier relationships	395,911		143,038		252,873		11.9	393,426		127,462		265,964		12.2
Other intangible assets	34,673		30,166		4,507		7.5	34,254		28,456		5,798		7.1
Total amortizable permits and other intangible assets	603,758		243,902		359,856		14.5	599,317		223,219		376,098		13.9
Trademarks and trade names	122,972		—		122,972		Indefinite	122,623		—		122,623		Indefinite
Total permits and other intangible assets	$	726,730	$	243,902	$	482,828		$	721,940	$	223,219	$	498,721

Schedule of finite-lived intangible assets

As of June 30, 2017 and December 31, 2016, the Company's total finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):



	June 30, 2017							December 31, 2016
	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Remaining Amortization Period (in years)
Permits	$	173,174	$	70,698	$	102,476	21.4	$	171,637	$	67,301	$	104,336	18.9
Customer and supplier relationships	395,911		143,038		252,873		11.9	393,426		127,462		265,964		12.2
Other intangible assets	34,673		30,166		4,507		7.5	34,254		28,456		5,798		7.1
Total amortizable permits and other intangible assets	603,758		243,902		359,856		14.5	599,317		223,219		376,098		13.9
Trademarks and trade names	122,972		—		122,972		Indefinite	122,623		—		122,623		Indefinite
Total permits and other intangible assets	$	726,730	$	243,902	$	482,828		$	721,940	$	223,219	$	498,721

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, 2017 was as follows (in thousands):



Years Ending December 31,	Expected Amortization
2017 (six months)	$	18,078
2018	34,091
2019	31,238
2020	28,756
2021	26,557
Thereafter	221,136
	$	359,856