GOODWILL AND INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2021

GOODWILL AND INTANGIBLE ASSETS

Schedule of changes in goodwill

	Waste Solutions				Field Services				Energy Waste
			Accumulated				Accumulated				Accumulated
$s in thousands	Gross		Impairment		Gross		Impairment		Gross		Impairment		Total
Balance at December 31, 2019	$	166,415	$	(6,870)	$	298,579	$	—	$	308,856	$	—	$	766,980
Impairment charges		—		—		—		(19,900)		—		(363,900)		(383,800)
NRC Merger purchase price allocation adjustment		—		—		(61,735)		—		90,647		—		28,912
Impact Environmental acquisition		—		—		300		—		—		—		300
Foreign currency translation		448		—		197		—		—		—		645
Balance at December 31, 2020	$	166,863	$	(6,870)	$	237,341	$	(19,900)	$	399,503	$	(363,900)	$	413,037
Foreign currency translation		62		—		27		—		—		—		89
Balance at December 31, 2021	$	166,925	$	(6,870)	$	237,368	$	(19,900)	$	399,503	$	(363,900)	$	413,126

Schedule of intangible assets, net

	2021						2020
			Accumulated						Accumulated
$s in thousands	Cost		Amortization		Net		Cost		Amortization		Net
Amortizing intangible assets:
Permits, licenses and lease	$	174,959	$	(27,170)	$	147,789	$	174,885	$	(23,005)	$	151,880
Customer relationships		340,065		(87,952)		252,113		340,032		(61,778)		278,254
Technology - formulae and processes		7,166		(2,531)		4,635		7,142		(2,293)		4,849
Customer backlog		3,652		(2,752)		900		3,652		(2,387)		1,265
Tradename		10,390		(10,390)		—		10,390		(8,015)		2,375
Developed software		2,903		(2,475)		428		2,902		(2,182)		720
Non-compete agreements		5,573		(5,211)		362		5,571		(4,318)		1,253
Internet domain and website		536		(213)		323		536		(184)		352
Database		390		(235)		155		389		(214)		175
Total amortizing intangible assets		545,634		(138,929)		406,705		545,499		(104,376)		441,123
Non-amortizing intangible assets:
Permits and licenses		82,734		—		82,734		82,732		—		82,732
Tradename		134		—		134		133		—		133
Total intangible assets	$	628,502	$	(138,929)	$	489,573	$	628,364	$	(104,376)	$	523,988

Schedule of future amortization expense of amortizing intangible assets

	Expected
$s in thousands	Amortization
2022	$	31,403
2023		31,216
2024		30,830
2025		30,586
2026		29,767
Thereafter		252,903
	$	406,705