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Related Party Transactions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]      
Rent expense $ 19,600 $ 17,200 $ 12,900
Net charter income (expense) $ 766,252 969,703 902,960
Percentage of tax benefits realized payable 85.00%    
Percentage retained under tax receivable agreement 15.00%    
Tax receivable agreement liability $ 45,500    
Tax receivable agreement liability, discount rate (percent) 5.67%    
Affiliated Entity      
Related Party Transaction [Line Items]      
Rent expense $ 7,600 7,400 5,800
Western Airlines      
Related Party Transaction [Line Items]      
Net charter income (expense) $ (2,000) $ (1,500) $ 1,000