Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Intangible assets and related accumulated amortization
Amortization	$ (600)	$ (600)	$ (597)
Intangible assets, ending balance	1,234
Customer contracts, lists and relationships
Intangible assets and related accumulated amortization
Intangible assets, beginning balance	1,926	2,526
Amortization	(600)	(600)
Intangible assets, ending balance	$ 1,326	$ 1,926	$ 2,526