GOODWILL AND INTANGIBLE ASSETS (Tables)

3 Months Ended

Mar. 31, 2017

GOODWILL AND INTANGIBLE ASSETS

Schedule of changes in goodwill

$s in thousands	Environmental Services		Field & Industrial Services		Total
Balance at December 31, 2016	$	149,490	$	44,131	$	193,621
Foreign currency translation	144		—		144
Balance at March 31, 2017	$	149,634	$	44,131	$	193,765

Schedule of intangible assets, net

	March 31, 2017							December 31, 2016
$s in thousands	Cost		Accumulated Amortization			Net		Cost		Accumulated Amortization			Net
Amortizing intangible assets:
Permits, licenses and lease	$	110,517	$	(10,170	)	$	100,347	$	110,341	$	(9,462	)	$	100,879
Customer relationships	84,740		(15,920		)	68,820		84,711		(14,519		)	70,192
Technology - formulae and processes	6,827		(1,371		)	5,456		6,770		(1,305		)	5,465
Customer backlog	3,652		(1,017		)	2,635		3,652		(926		)	2,726
Tradename	4,318		(4,009		)	309		4,318		(3,650		)	668
Developed software	2,910		(1,073		)	1,837		2,907		(994		)	1,913
Non-compete agreements	747		(746		)	1		747		(742		)	5
Internet domain and website	540		(79		)	461		540		(72		)	468
Database	388		(127		)	261		387		(118		)	269
Total amortizing intangible assets	214,639		(34,512		)	180,127		214,373		(31,788		)	182,585
Nonamortizing intangible assets:
Permits and licenses	51,650		—			51,650		51,645		—			51,645
Tradename	128		—			128		126		—			126
Total intangible assets, net	$	266,417	$	(34,512	)	$	231,905	$	266,144	$	(31,788	)	$	234,356