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Related Party Transactions (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Related Party Transaction [Line Items]        
Net charter income (expense) $ 201,282 $ 231,838 $ 433,687 $ 452,651
Percentage of tax benefits realized payable 85.00%   85.00%  
Tax receivable agreement, liability $ 50,900   $ 50,900  
Tax receivable agreement, liability, discount rate 5.83%   5.83%  
Affiliated Entity        
Related Party Transaction [Line Items]        
Rent expense $ 2,000 1,600 $ 4,000 3,500
Western Airlines        
Related Party Transaction [Line Items]        
Net charter income (expense) $ (400) $ (300) $ 800 $ 700