GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in goodwill by segment for the nine months ended September 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	—			2,999		5,613		—		8,612
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	338			1,398		2,340		—		4,076
Balance at September 30, 2017	$	60,154		$	112,365	$	306,209	$	—	$	478,728

Summary of indefinite-lived intangible assets

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



	September 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	$	174,571	$	72,788	$	101,783	21.2	$	171,637	$	67,301	$	104,336	18.9
Customer and supplier relationships	398,778		151,744		247,034		11.5	393,426		127,462		265,964		12.2
Other intangible assets	36,077		31,414		4,663		7.3	34,254		28,456		5,798		7.1
Total amortizable permits and other intangible assets	609,426		255,946		353,480		14.2	599,317		223,219		376,098		13.9
Trademarks and trade names	124,159		—		124,159		Indefinite	122,623		—		122,623		Indefinite
Total permits and other intangible assets	$	733,585	$	255,946	$	477,639		$	721,940	$	223,219	$	498,721

Schedule of finite-lived intangible assets

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



	September 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	$	174,571	$	72,788	$	101,783	21.2	$	171,637	$	67,301	$	104,336	18.9
Customer and supplier relationships	398,778		151,744		247,034		11.5	393,426		127,462		265,964		12.2
Other intangible assets	36,077		31,414		4,663		7.3	34,254		28,456		5,798		7.1
Total amortizable permits and other intangible assets	609,426		255,946		353,480		14.2	599,317		223,219		376,098		13.9
Trademarks and trade names	124,159		—		124,159		Indefinite	122,623		—		122,623		Indefinite
Total permits and other intangible assets	$	733,585	$	255,946	$	477,639		$	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 September 30, 2017 was as follows (in thousands):



Years Ending December 31,	Expected Amortization
2017 (three months)	$	9,039
2018	34,463
2019	31,521
2020	29,206
2021	26,747
Thereafter	222,504
	$	353,480