Nature of Business and Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred financing costs:
Amortization of deferred financing costs	$ 501	$ 504	$ 507
Accumulated amortization of deferred financing costs	1,500	1,000
Deferred financing costs, net	$ 1,800	$ 2,300
Customer relationships, non-compete agreement and affiliate agreements | Minimum
Goodwill and other intangibles:
useful lives	1 year
Customer relationships, non-compete agreement and affiliate agreements | Maximum
Goodwill and other intangibles:
useful lives	10 years