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Income Taxes - Deferred Taxes (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating loss $ 252us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 188us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Accrued rent 0save_DeferredTaxAssetsAccruedRent 1,872save_DeferredTaxAssetsAccruedRent
Deferred revenue 410us-gaap_DeferredTaxAssetsDeferredIncome 6,241us-gaap_DeferredTaxAssetsDeferredIncome
Nondeductible accruals 12,239save_DeferredTaxAssetsNondeductibleReservesandAccruals 6,702save_DeferredTaxAssetsNondeductibleReservesandAccruals
Deferred manufacturing credits 848save_DeferredTaxAssetsDeferredManufacturingCredits 3,309save_DeferredTaxAssetsDeferredManufacturingCredits
Unrealized gains/losses on derivatives 1,865us-gaap_DeferredTaxAssetsDerivativeInstruments 0us-gaap_DeferredTaxAssetsDerivativeInstruments
Accrued maintenance 3,073save_DeferredTaxAssetsAccruedMaintenance 1,225save_DeferredTaxAssetsAccruedMaintenance
Equity compensation 4,514us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 2,687us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Other 661us-gaap_DeferredTaxAssetsOther 16us-gaap_DeferredTaxAssetsOther
Deferred tax assets 23,862us-gaap_DeferredTaxAssetsGross 22,240us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Capitalized interest 568us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInterest 736us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInterest
Deferred gain and losses on leases, net 2,349save_DeferredTaxLiabilitiesDeferredGain 1,882save_DeferredTaxLiabilitiesDeferredGain
Accrued rent 2,560save_DeferredTaxLiabilitiesAccruedRent 0save_DeferredTaxLiabilitiesAccruedRent
Prepaid expenses 1,681us-gaap_DeferredTaxLiabilitiesPrepaidExpenses 0us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Property, plant and equipment 37,369us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 6,384us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Accrued engine maintenance 45,702save_DeferredTaxLiabilitiesAccruedAircraftMaintenanceExpenses 45,911save_DeferredTaxLiabilitiesAccruedAircraftMaintenanceExpenses
Deferred tax liabilities 90,229us-gaap_DeferredIncomeTaxLiabilities 54,913us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax assets (liabilities) (66,367)us-gaap_DeferredTaxAssetsLiabilitiesNet (32,673)us-gaap_DeferredTaxAssetsLiabilitiesNet
Assets:    
Current deferred tax assets, net 9,643us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 16,243us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Liabilities:    
Noncurrent deferred tax liabilities, net $ 76,010us-gaap_DeferredTaxLiabilitiesNoncurrent $ 48,916us-gaap_DeferredTaxLiabilitiesNoncurrent