Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Mar. 30, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 82,038		$ 82,038		$ 82,038
Accumulated Amortization	(19,706)		(19,706)		(15,495)
Goodwill	74,213		74,213		74,213
Total	108,543		108,543		108,543
Amortization of intangible assets	2,095	$ 2,136	4,211	$ 4,097
Goodwill	74,213		74,213		74,213
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	78,942		78,942		78,942
Accumulated Amortization	(18,991)		$ (18,991)		(15,044)
Useful Life			10 years
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,003		$ 2,003		2,003
Accumulated Amortization	(250)		$ (250)		(150)
Useful Life			10 years
Non-compete and other agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	289		$ 289		289
Accumulated Amortization	(181)		$ (181)		(109)
Useful Life			2 years
SCB trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	694		$ 694		694
Accumulated Amortization	(174)		$ (174)		(104)
Useful Life			5 years
Rail easement
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	110		$ 110		110
Accumulated Amortization	(110)		$ (110)		(88)
Useful Life			2 years
SBC Materials International, Inc. | Non-compete and other agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill						$ 745
Environmental Solutions | Operating Segments
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 57,591		$ 57,591		57,591
Percentage of fair value in excess of carrying amount	5.40%		5.40%
Basis point increase to discount rate assumption			0.75%
Basis point decrease to short term revenue and residual growth rates assumptions			1.00%
75 bps Discount Rate | Environmental Solutions | Operating Segments
Acquired Finite-Lived Intangible Assets [Line Items]
Approximate Percent Decrease in Estimated Fair Value			6.50%
-100 bps Growth Rate | Environmental Solutions | Operating Segments
Acquired Finite-Lived Intangible Assets [Line Items]
Approximate Percent Decrease in Estimated Fair Value			5.70%
SCB trade name
Acquired Indefinite-lived Intangible Assets [Line Items]
Charah trade name	$ 34,330		$ 34,330		$ 34,330