GOODWILL AND INTANGIBLE ASSETS (Tables)

3 Months Ended

Mar. 31, 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
Foreign currency translation	1,090		—		1,090
Balance at March 31, 2016	$	148,782	$	44,131	$	192,913

Schedule of intangible assets

	March 31, 2016							December 31, 2015
$s in thousands	Cost		Accumulated Amortization			Net		Cost		Accumulated Amortization			Net
Amortizing intangible assets:
Permits, licenses and lease	$	111,056	$	(7,575	)	$	103,481	$	109,652	$	(6,682	)	$	102,970
Customer relationships	82,226		(10,424		)	71,802		82,021		(9,015		)	73,006
Technology - formulae and processes	7,017		(1,184		)	5,833		6,560		(1,054		)	5,506
Customer backlog	3,652		(652		)	3,000		3,652		(561		)	3,091
Tradename	4,318		(2,570		)	1,748		4,318		(2,210		)	2,108
Developed software	2,917		(771		)	2,146		2,899		(678		)	2,221
Non-compete agreements	732		(732		)	—		732		(732		)	—
Internet domain and website	540		(51		)	489		540		(44		)	496
Database	390		(97		)	293		385		(85		)	300
Total amortizing intangible assets	212,848		(24,056		)	188,792		210,759		(21,061		)	189,698
Nonamortizing intangible assets:
Permits and licenses	49,750		—			49,750		49,750		—			49,750
Tradename	131		—			131		123		—			123
Total intangible assets, net	$	262,729	$	(24,056	)	$	238,673	$	260,632	$	(21,061	)	$	239,571