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Commitments and Contingencies (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
aircraft
Future minimum rental payments required under operating leases  
July through December 2016 $ 102,521
2017 193,838
2018 155,540
2019 121,951
2020 134,358
Thereafter 349,039
Total future lease obligations $ 1,057,247
E 175  
Future minimum rental payments required under operating leases  
Number of aircrafts committed to purchase | aircraft 48