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Debt and Other Obligations - Capital Leases (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]    
2015 $ 1,289save_CapitalLeasesFutureMinimumPaymentsPresentValueofNetMinimumPaymentsNextTwelveMonths $ 1,083save_CapitalLeasesFutureMinimumPaymentsPresentValueofNetMinimumPaymentsNextTwelveMonths
2016 1,002save_CapitalLeasesFutureMinimumPaymentsPresentValueofNetMinimumPaymentsDueinTwoYears 966save_CapitalLeasesFutureMinimumPaymentsPresentValueofNetMinimumPaymentsDueinTwoYears
2017 39save_CapitalLeasesFutureMinimumPaymentsPresentValueofNetMinimumPaymentsDueinThreeYears 0save_CapitalLeasesFutureMinimumPaymentsPresentValueofNetMinimumPaymentsDueinThreeYears
2018 42save_CapitalLeasesFutureMinimumPaymentsPresentValueofNetMinimumPaymentsDueinFourYears 0save_CapitalLeasesFutureMinimumPaymentsPresentValueofNetMinimumPaymentsDueinFourYears
2019 11save_CapitalLeasesFutureMinimumPaymentsPresentValueofNetMinimumPaymentsDueinFiveYears 0save_CapitalLeasesFutureMinimumPaymentsPresentValueofNetMinimumPaymentsDueinFiveYears
2020 and thereafter 0save_CapitalLeasesFutureMinimumPaymentsPresentValueofNetMinimumPaymentsDueThereafter 0save_CapitalLeasesFutureMinimumPaymentsPresentValueofNetMinimumPaymentsDueThereafter
Present value of minimum lease payments $ 2,383us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments $ 2,049us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments