GOODWILL AND INTANGIBLE ASSETS (Tables)

9 Months Ended

Sep. 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		1,327		—		1,327
Balance at September 30, 2017	$	150,817	$	44,131	$	194,948

Schedule of intangible assets, net

	September 30, 2017						December 31, 2016
			Accumulated						Accumulated
$s in thousands	Cost		Amortization		Net		Cost		Amortization		Net
Amortizing intangible assets:
Permits, licenses and lease	$	111,961	$	(11,814)	$	100,147	$	110,341	$	(9,462)	$	100,879
Customer relationships		85,003		(18,781)		66,222		84,711		(14,519)		70,192
Technology - formulae and processes		7,296		(1,582)		5,714		6,770		(1,305)		5,465
Customer backlog		3,652		(1,200)		2,452		3,652		(926)		2,726
Tradename		4,318		(4,318)		—		4,318		(3,650)		668
Developed software		2,928		(1,246)		1,682		2,907		(994)		1,913
Non-compete agreements		748		(748)		—		747		(742)		5
Internet domain and website		540		(93)		447		540		(72)		468
Database		393		(148)		245		387		(118)		269
Total amortizing intangible assets		216,839		(39,930)		176,909		214,373		(31,788)		182,585
Nonamortizing intangible assets:
Permits and licenses		51,691		—		51,691		51,645		—		51,645
Tradename		136		—		136		126		—		126
Total intangible assets	$	268,666	$	(39,930)	$	228,736	$	266,144	$	(31,788)	$	234,356