Intangible Assets and Goodwill - Schedule of Intangible Assets (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Gross Carrying Amount	$ 72,344
Accumulated Amortization	11,229
Net Carrying Amount	$ 61,115
Contracts in Progress [Member]
Weighted average remaining useful life (Months)	7 (Months)
Trademarks and Tradenames [Member]
Weighted average remaining useful life (Months)	72.7 (Months)
Customer Relationships [Member]
Weighted average remaining useful life (Months)	72.7 (Months)
Non-compete [Member]
Weighted average remaining useful life (Months)	48.7 (Months)
Indefinite-lived Intangible Assets [Member] \| Goodwill [Member]
Gross Carrying Amount	$ 35,672
Accumulated Amortization
Net Carrying Amount	35,672
Definite Intangible Assets [Member]
Gross Carrying Amount	36,672
Accumulated Amortization	11,229
Net Carrying Amount	25,443
Definite Intangible Assets [Member] \| Contracts in Progress [Member]
Gross Carrying Amount	10,632
Accumulated Amortization	7,695
Net Carrying Amount	2,937
Definite Intangible Assets [Member] \| Trademarks and Tradenames [Member]
Gross Carrying Amount	2,749
Accumulated Amortization	370
Net Carrying Amount	2,379
Definite Intangible Assets [Member] \| Customer Relationships [Member]
Gross Carrying Amount	22,743
Accumulated Amortization	3,059
Net Carrying Amount	19,684
Definite Intangible Assets [Member] \| Non-compete [Member]
Gross Carrying Amount	548
Accumulated Amortization	105
Net Carrying Amount	$ 443