GOODWILL AND INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2018

GOODWILL AND INTANGIBLE ASSETS

Schedule of changes in goodwill

					Field &
	Environmental				Industrial
	Services				Services
			Accumulated				Accumulated
$s in thousands	Gross		Impairment		Gross		Impairment		Total
Balance at December 31, 2017	$	150,699	$	(5,457)	$	44,131	$	—	$	189,373
Foreign currency translation		(894)		—		—		—		(894)
Balance at June 30, 2018	$	149,805	$	(5,457)	$	44,131	$	—	$	188,479

Schedule of intangible assets, net

	June 30, 2018						December 31, 2017
			Accumulated						Accumulated
$s in thousands	Cost		Amortization		Net		Cost		Amortization		Net
Amortizing intangible assets:
Permits, licenses and lease	$	110,726	$	(13,540)	$	97,186	$	111,818	$	(12,459)	$	99,359
Customer relationships		84,780		(22,892)		61,888		84,977		(20,168)		64,809
Technology - formulae and processes		6,895		(1,661)		5,234		7,250		(1,630)		5,620
Customer backlog		3,652		(1,474)		2,178		3,652		(1,291)		2,361
Tradename		4,318		(4,318)		—		4,318		(4,318)		—
Developed software		2,912		(1,452)		1,460		2,926		(1,319)		1,607
Non-compete agreements		747		(747)		—		748		(748)		—
Internet domain and website		540		(115)		425		540		(100)		440
Database		389		(160)		229		393		(153)		240
Total amortizing intangible assets		214,959		(46,359)		168,600		216,622		(42,186)		174,436
Nonamortizing intangible assets:
Permits and licenses		48,210		—		48,210		48,241		—		48,241
Tradename		129		—		129		135		—		135
Total intangible assets	$	263,298	$	(46,359)	$	216,939	$	264,998	$	(42,186)	$	222,812