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Special Items (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Total Special items $ 465,600   $ 465,649
Proceeds from settlement of residual value guarantee aircraft agreements     90,000
CRJ 200      
Total Special items     424,466
ERJ 145      
Total Special items     41,183
Estimated fair value $ 41,200   41,200
SkyWest Airlines      
Total Special items     184,295
Proceeds from settlement of residual value guarantee aircraft agreements   $ 90,000  
ExpressJet Airlines Inc      
Total Special items     $ 281,354
ExpressJet Airlines Inc | CRJ 200      
Total Special items   $ 240,200