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Commitments and Contingencies (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
aircraft
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Commitments and Contingencies      
Number of aircraft leased by the entity | aircraft 470    
Future minimum rental payments required under operating leases      
2016 $ 269,520    
2017 192,122    
2018 154,077    
2019 121,107    
2020 133,659    
Thereafter 349,038    
Total future lease obligations 1,219,523    
Rental expense for non-cancelable aircraft operating leases 273,696 $ 305,334 $ 325,360
Minimum rental expense for airport station rents $ 35,100 $ 29,000 $ 35,100
Leveraged lease agreements term, maximum 11 years    
Sale lease-back agreement, sales price of the facility $ 18,500