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Special Charges and Credits (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
aircraft_slot
Special Charges and Credits [Abstract]        
Number of permanent air carrier slots transferred       4save_NumberOfPermanentAirCarrierSlotsTransferred
Proceeds from sale of slots   $ 0save_ProceedsfromSaleofAirlineSlots $ 0save_ProceedsfromSaleofAirlineSlots $ 9,060save_ProceedsfromSaleofAirlineSlots
Gain on slot sale $ 9,100save_GainLossonDispositionofAirlineSlots $ 0save_GainLossonDispositionofAirlineSlots $ 0save_GainLossonDispositionofAirlineSlots $ 9,060save_GainLossonDispositionofAirlineSlots