Intangible Assets and Goodwill - Schedule of Intangible Assets (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Gross Carrying Amount	$ 72,344
Accumulated Amortization	13,482
Net Carrying Amount	$ 58,862
Contracts in Progress [Member]
Weighted average remaining useful life (Months)	3.7 (Months)
Trademarks and Tradenames [Member]
Weighted average remaining useful life (Months)	69.7 (Months)
Customer Relationships [Member]
Weighted average remaining useful life (Months)	69.7 (Months)
Non-compete [Member]
Weighted average remaining useful life (Months)	45.7 (Months)
Indefinite-lived Intangible Assets [Member] \| Goodwill [Member]
Gross Carrying Amount	$ 35,672
Accumulated Amortization
Net Carrying Amount	35,672
Definite-lived Intangible Assets [Member]
Gross Carrying Amount	36,672
Accumulated Amortization	13,482
Net Carrying Amount	23,190
Definite-lived Intangible Assets [Member] \| Contracts in Progress [Member]
Gross Carrying Amount	10,632
Accumulated Amortization	9,010
Net Carrying Amount	1,622
Definite-lived Intangible Assets [Member] \| Trademarks and Tradenames [Member]
Gross Carrying Amount	2,749
Accumulated Amortization	468
Net Carrying Amount	2,281
Definite-lived Intangible Assets [Member] \| Customer Relationships [Member]
Gross Carrying Amount	22,743
Accumulated Amortization	3,872
Net Carrying Amount	18,871
Definite-lived Intangible Assets [Member] \| Non-compete [Member]
Gross Carrying Amount	548
Accumulated Amortization	132
Net Carrying Amount	$ 416