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Related Party Transactions (Details)
$ in Thousands
 12 Months Ended
Aug. 26, 2016
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Related Party Transaction [Line Items]        
Rent expense   $ 19,100 $ 19,600 $ 17,200
Net charter expense   $ (397,369) (766,252) (969,703)
Conversion ratio, preferred stock to common stock (percent) 1      
Tax benefits realized payable (percent)   85.00%    
Percentage retained under tax receivable agreement (percent)   15.00%    
Tax receivable agreement liability   $ 124,600    
Tax receivable agreement liability, discount rate (percent)   4.96%    
Time period over which the cash savings is expected to be realized   20 years    
Expected TRA payment   $ 800    
Estimated termination payment   105,300    
Affiliated Entity        
Related Party Transaction [Line Items]        
Rent expense   8,000 7,600 7,400
Western Airways, Inc.        
Related Party Transaction [Line Items]        
Net charter expense   $ 1,300 $ 2,000 $ 1,500