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Commitments and Contingencies (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
aircraft
Future minimum rental payments required under operating leases  
October through December 2016 $ 67,280
2017 191,086
2018 155,584
2019 122,627
2020 134,867
Thereafter 349,039
Total future lease obligations $ 1,020,483
E 175  
Future minimum rental payments required under operating leases  
Number of aircrafts committed to purchase | aircraft 37