GOODWILL AND INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2017

GOODWILL AND INTANGIBLE ASSETS

Schedule of changes in goodwill

			Field &
	Environmental		Industrial
$s in thousands	Services		Services		Total
Balance at December 31, 2016	$	149,490	$	44,131	$	193,621
Foreign currency translation		603		—		603
Balance at June 30, 2017	$	150,093	$	44,131	$	194,224

Schedule of intangible assets, net

	June 30, 2017						December 31, 2016
			Accumulated						Accumulated
$s in thousands	Cost		Amortization		Net		Cost		Amortization		Net
Amortizing intangible assets:
Permits, licenses and lease	$	111,078	$	(10,966)	$	100,112	$	110,341	$	(9,462)	$	100,879
Customer relationships		84,843		(17,340)		67,503		84,711		(14,519)		70,192
Technology - formulae and processes		7,009		(1,464)		5,545		6,770		(1,305)		5,465
Customer backlog		3,652		(1,109)		2,543		3,652		(926)		2,726
Tradename		4,318		(4,318)		—		4,318		(3,650)		668
Developed software		2,917		(1,157)		1,760		2,907		(994)		1,913
Non-compete agreements		747		(747)		—		747		(742)		5
Internet domain and website		540		(86)		454		540		(72)		468
Database		390		(137)		253		387		(118)		269
Total amortizing intangible assets		215,494		(37,324)		178,170		214,373		(31,788)		182,585
Nonamortizing intangible assets:
Permits and licenses		51,666		—		51,666		51,645		—		51,645
Tradename		131		—		131		126		—		126
Total intangible assets	$	267,291	$	(37,324)	$	229,967	$	266,144	$	(31,788)	$	234,356