Intangible Assets - Finite Lived Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite Lived Intangible Assets And Liabilities [Line Items]
Gross Value, Assets	$ 97,898	$ 32,309
Accumulated Amortization, Assets	(32,183)	(16,156)
Net Value, Assets	65,715	16,153
Total net amortized intangible assets, Gross Value	90,898
Total net amortized intangible assets, Accumulated Amortization	(27,457)
Total net amortized intangible assets, Net Value	63,441
Customer Relationships [Member]
Finite Lived Intangible Assets And Liabilities [Line Items]
Gross Value, Assets	38,137
Accumulated Amortization, Assets	(7,640)
Net Value, Assets	30,497
Permits [Member]
Finite Lived Intangible Assets And Liabilities [Line Items]
Gross Value, Assets	25,959	25,959
Accumulated Amortization, Assets	(13,494)	(12,504)
Net Value, Assets	12,465	13,455
Backlog [Member]
Finite Lived Intangible Assets And Liabilities [Line Items]
Gross Value, Assets	9,713
Accumulated Amortization, Assets	(5,795)
Net Value, Assets	3,918
Developed Technology [Member]
Finite Lived Intangible Assets And Liabilities [Line Items]
Gross Value, Assets	9,233
Accumulated Amortization, Assets	(1,384)
Net Value, Assets	7,849
Trademarks/Trade Names [Member]
Finite Lived Intangible Assets And Liabilities [Line Items]
Gross Value, Assets	9,075	4,100
Accumulated Amortization, Assets	(1,381)	(2,159)
Net Value, Assets	7,694	1,941
Favorable Contracts, Covenants Not to Compete and Other [Member]
Finite Lived Intangible Assets And Liabilities [Line Items]
Gross Value, Assets	5,781
Accumulated Amortization, Assets	(2,489)
Net Value, Assets	3,292
Unfavorable Contracts and Leases [Member]
Finite Lived Intangible Assets And Liabilities [Line Items]
Gross Value, Liabilities	7,000
Accumulated Amortization, Liabilities	(4,726)
Net Value, Liabilities	$ 2,274
Customer lists [Member]
Finite Lived Intangible Assets And Liabilities [Line Items]
Gross Value, Assets		2,200
Accumulated Amortization, Assets		(1,467)
Net Value, Assets		733
Covenants not to compete and other [Member]
Finite Lived Intangible Assets And Liabilities [Line Items]
Gross Value, Assets		50
Accumulated Amortization, Assets		(26)
Net Value, Assets		$ 24