Intangible Assets and Goodwill - Schedule of Intangible Assets (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Gross Carrying Amount	$ 72,344
Accumulated Amortization	15,735
Net Carrying Amount	$ 56,609
Contracts in Progress [Member]
Weighted average remaining useful life (Months)	0.7 (Months)
Trademarks and Tradenames [Member]
Weighted average remaining useful life (Months)	66.7 (Months)
Customer Relationships [Member]
Weighted average remaining useful life (Months)	66.7 (Months)
Non-compete [Member]
Weighted average remaining useful life (Months)	42.7 (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	15,735
Net Carrying Amount	20,937
Definite-lived Intangible Assets [Member] \| Contracts in Progress [Member]
Gross Carrying Amount	10,632
Accumulated Amortization	10,325
Net Carrying Amount	307
Definite-lived Intangible Assets [Member] \| Trademarks and Tradenames [Member]
Gross Carrying Amount	2,749
Accumulated Amortization	566
Net Carrying Amount	2,183
Definite-lived Intangible Assets [Member] \| Customer Relationships [Member]
Gross Carrying Amount	22,743
Accumulated Amortization	4,686
Net Carrying Amount	18,057
Definite-lived Intangible Assets [Member] \| Non-compete [Member]
Gross Carrying Amount	548
Accumulated Amortization	158
Net Carrying Amount	$ 390