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Related Party Transactions (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Related Party Transaction [Line Items]        
Net charter income (expense) $ 176,553 $ 254,047 $ 610,240 $ 706,698
Percentage of tax benefits realized payable 85.00%   85.00%  
Tax receivable agreement, liability $ 48,300   $ 48,300  
Tax receivable agreement, liability, discount rate 5.51%   5.51%  
Affiliated Entity        
Related Party Transaction [Line Items]        
Rent expense $ 2,500 2,100 $ 6,500 5,600
Western Airlines        
Related Party Transaction [Line Items]        
Net charter income (expense) $ 100 $ (400) $ (700) $ (1,100)