GOODWILL AND INTANGIBLE ASSETS (Tables)

9 Months Ended

Sep. 30, 2016

GOODWILL AND INTANGIBLE ASSETS

Schedule of changes in goodwill

$s in thousands	Environmental Services		Field & Industrial Services		Total
Balance at December 31, 2015	$	147,692	$	44,131	$	191,823
ESI acquisition	1,011		—		1,011
Foreign currency translation	821		—		821
Balance at September 30, 2016	$	149,524	$	44,131	$	193,655

Schedule of intangible assets

	September 30, 2016							December 31, 2015
$s in thousands	Cost		Accumulated Amortization			Net		Cost		Accumulated Amortization			Net
Amortizing intangible assets:
Permits, licenses and lease	$	110,816	$	(8,877	)	$	101,939	$	109,652	$	(6,682	)	$	102,970
Customer relationships	82,945		(13,149		)	69,796		82,021		(9,015		)	73,006
Technology - formulae and processes	6,924		(1,279		)	5,645		6,560		(1,054		)	5,506
Customer backlog	3,652		(835		)	2,817		3,652		(561		)	3,091
Tradename	4,318		(3,290		)	1,028		4,318		(2,210		)	2,108
Developed software	2,914		(922		)	1,992		2,899		(678		)	2,221
Non-compete agreements	747		(738		)	9		732		(732		)	—
Internet domain and website	540		(65		)	475		540		(44		)	496
Database	389		(112		)	277		385		(85		)	300
Total amortizing intangible assets	213,245		(29,267		)	183,978		210,759		(21,061		)	189,698
Nonamortizing intangible assets:
Permits and licenses	50,359		—			50,359		49,750		—			49,750
Tradename	129		—			129		123		—			123
Total intangible assets, net	$	263,733	$	(29,267	)	$	234,466	$	260,632	$	(21,061	)	$	239,571