Related Party Transactions (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Aug. 26, 2016	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2017 aircraft	Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items]
Net charter expense		$ 93,533	$ 95,177	$ 179,855	$ 226,434
Aircraft, held-for-sale | aircraft						2
Conversion ratio, preferred stock to common stock	1
Percentage of tax benefits realized payable		85.00%		85.00%
Percentage retained under tax receivable agreement				15.00%
Tax receivable agreement, liability		$ 124,600		$ 124,600			$ 124,600
Time period over which the cash savings is expected to be realized (in years)				20 years
Expected TRA payment		2,100		$ 2,100
Estimated termination payment		$ 100,800		$ 100,800
Discount rate, tax receivable agreement liability		5.61%		5.61%
Affiliated Entity
Related Party Transaction [Line Items]
Rent expense		$ 1,700	1,800	$ 3,500	4,500
Western Airways
Related Party Transaction [Line Items]
Net charter expense		$ (700)	$ (500)	$ (600)	$ (500)