Debt and Other Obligations - Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Commitment fees	$ 127	$ 54
Amortization of deferred financing costs	3,435	1,165
Total	41,641	20,279
Senior loans
Debt Instrument [Line Items]
Interest expense, debt	19,759	15,429
Junior loans
Debt Instrument [Line Items]
Interest expense, debt	3,568	2,997
Equipment Notes, Series A
Debt Instrument [Line Items]
Interest expense, debt	11,509	494
Equipment Notes, Series B
Debt Instrument [Line Items]
Interest expense, debt	$ 3,243	$ 140