Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Goodwill, gross carrying amount	$ 0	$ 3,020
Goodwill	0	3,020	$ 1,733
Indefinite-lived intangible assets Gross Net Carrying Value	394	394
Indefinite-Lived Intangible Assets (Including Goodwill)	394	3,414
Finite lived intangible assets Gross Carrying Amount	3,387	3,387
Gross Carrying Amount	3,781	6,801
Finite lived intangible assets Accumulated Amortization	(2,192)	(1,664)
Total	1,195	1,723
Intangible Assets, Net (Including Goodwill)	1,589	5,137
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets Gross Carrying Amount	2,097	2,097
Finite lived intangible assets Accumulated Amortization	(902)	(586)
Total	1,195	1,511
Purchased backlog
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets Gross Carrying Amount	1,290	1,290
Finite lived intangible assets Accumulated Amortization	(1,290)	(1,078)
Total	$ 0	$ 212