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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Tax effect on fair value of interest rate swap agreements | $ 1,769 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax | $ 6,514 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax | $ 1,035 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
Tax expense (benefit) associated with change in pension actuarial loss | (446)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax |  |
Dividends per share | $ 0.10 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.10 us-gaap_CommonStockDividendsPerShareDeclared
Stated interest rate on debt agreement | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage |  |
Convertible senior notes due |  |  | 2029
Paid-In Capital [Member] |  |  |
Tax effect on the derecognition of equity component of 5.0% convertible notes |  |  | 662 sah_TaxEffectOfAdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Stated interest rate on debt agreement |  |  | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Tax effect on fair value of interest rate swap agreements | 1,769 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 6,514 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 1,035 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Tax expense (benefit) associated with change in pension actuarial loss | $ (446)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 460 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (98)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Retained Earnings / (Accumulated Deficit) [Member] |  |  |
Dividends per share | $ 0.10 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 0.10 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 0.10 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember

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