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Summary of Significant Accounting Policies - Maintenance Costs (Details) (USD $)
 0 Months Ended 12 Months Ended
Oct. 15, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]        
Amortization of heavy maintenance   $ 35,802,000save_AmortizationOfHeavyMaintenance $ 23,607,000save_AmortizationOfHeavyMaintenance $ 9,100,000save_AmortizationOfHeavyMaintenance
Deferred costs for heavy maintenance   33,600,000save_DeferredCostsForHeavyMaintenance 70,800,000save_DeferredCostsForHeavyMaintenance 61,600,000save_DeferredCostsForHeavyMaintenance
Deferred heavy maintenance, gross   198,900,000save_DeferredHeavyMaintenanceGross 165,300,000save_DeferredHeavyMaintenanceGross  
Accumulated heavy maintenance amortization   75,800,000save_AccumulatedHeavyMaintenanceAmortization 40,000,000save_AccumulatedHeavyMaintenanceAmortization  
Insurance deductible 800,000save_InsuranceDeductible      
Engine, replacement expense   2,300,000save_EngineReplacementExpense    
Airframe and Engine Maintenance Costs [Abstract]        
Flight hour-based maintenance expense   35,675,000save_MaintenanceExpenseFlightHourbased 30,322,000save_MaintenanceExpenseFlightHourbased 25,748,000save_MaintenanceExpenseFlightHourbased
Non-flight hour-based maintenance expense   38,281,000save_MaintenanceExpenseNonflightHourbased 29,821,000save_MaintenanceExpenseNonflightHourbased 23,712,000save_MaintenanceExpenseNonflightHourbased
Total maintenance, materials and repairs   $ 73,956,000save_MaintenanceExpenseAirframeandEngine $ 60,143,000save_MaintenanceExpenseAirframeandEngine $ 49,460,000save_MaintenanceExpenseAirframeandEngine