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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data | Total | Paid-In Capital [Member] | Retained Earnings / (Accumulated Deficit) [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Common Class A [Member] | Common Class A [Member] Treasury Stock [Member] | Common Class B [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2011 |  | $ 522,742 us-gaap_StockholdersEquity | $ 667,839 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 124,383 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (21,490)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 564 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ (248,675)us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 121 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Beginning Balance, Shares at Dec. 31, 2011 |  |  |  |  |  | 56,378,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 12,029,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Beginning Balance, Treasury Shares at Dec. 31, 2011 |  |  |  |  |  |  | 15,778,000 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Shares awarded under stock compensation plans |  | 2,333 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 2,327 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 6 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Shares awarded under stock compensation plans, shares |  |  |  |  |  | 608,000 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Issuance of common stock |  | 67,536 us-gaap_StockIssuedDuringPeriodValueNewIssues | 67,495 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 41 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Issuance of common stock, shares |  |  |  |  |  | 4,075,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Purchases of treasury stock |  | (82,924)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (82,924)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Purchases of treasury stock, shares |  |  |  |  |  |  | (4,364,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Income tax benefit associated with stock compensation plans |  | 3,207 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 3,207 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Derecognition of equity component of 5.0% Convertible Notes (1), net of tax expense of $662 | [1] | (76,701)us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments | (76,701)us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebtSubsequentAdjustments / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Fair value of interest rate swap agreements, net of tax expense/benefit of $1,035, $6,514 and $1,769 in 2012, 2013 and 2014 respectively |  | 1,687 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax |  |  | 1,687 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Change in pension actuarial loss, net of tax benefit of $98, expense of $460, and benefit of $446 in 2012, 2013 and 2014 respectively |  | (160)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax |  |  | (160)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Stock-based compensation expense |  | 122 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 122 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Restricted stock amortization |  | 5,038 sah_RestrictedStockAmortizationNetOfForfeitures | 5,038 sah_RestrictedStockAmortizationNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Other |  |  | (3)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 3 us-gaap_StockholdersEquityOther / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Other, shares |  |  |  |  |  | 291,000 us-gaap_StockholdersEquityOtherShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Net income (loss) |  | 89,101 us-gaap_NetIncomeLoss |  | 89,101 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Dividends ($0.10 per share) |  | (5,436)us-gaap_DividendsCommonStock |  | (5,436)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Ending Balance at Dec. 31, 2012 |  | 526,545 us-gaap_StockholdersEquity | 669,324 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 208,048 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (19,963)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 614 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | (331,599)us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 121 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Ending Balance, Shares at Dec. 31, 2012 |  |  |  |  |  | 61,352,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 12,029,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Ending Balance, Treasury Shares at Dec. 31, 2012 |  |  |  |  |  |  | 20,142,000 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Shares awarded under stock compensation plans |  | 2,171 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 2,169 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 2 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Shares awarded under stock compensation plans, shares |  |  |  |  |  | 209,000 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Purchases of treasury stock |  | (17,067)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (17,067)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Purchases of treasury stock, shares |  |  |  |  |  |  | (758,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Income tax benefit associated with stock compensation plans |  | 856 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 856 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Fair value of interest rate swap agreements, net of tax expense/benefit of $1,035, $6,514 and $1,769 in 2012, 2013 and 2014 respectively |  | 10,629 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax |  |  | 10,629 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Change in pension actuarial loss, net of tax benefit of $98, expense of $460, and benefit of $446 in 2012, 2013 and 2014 respectively |  | 752 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax |  |  | 752 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Restricted stock amortization |  | 7,208 sah_RestrictedStockAmortizationNetOfForfeitures | 7,208 sah_RestrictedStockAmortizationNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Other | [2] | 6,225 us-gaap_StockholdersEquityOther | 6,225 us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Other, shares | [2] |  |  |  |  | 23,000 us-gaap_StockholdersEquityOtherShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Net income (loss) |  | 81,618 us-gaap_NetIncomeLoss |  | 81,618 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Dividends ($0.10 per share) |  | (5,298)us-gaap_DividendsCommonStock |  | (5,298)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Ending Balance at Dec. 31, 2013 |  | 613,639 us-gaap_StockholdersEquity | 685,782 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 284,368 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (8,582)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 616 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | (348,666)us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 121 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Ending Balance, Shares at Dec. 31, 2013 |  |  |  |  |  | 61,584,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 12,029,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Ending Balance, Treasury Shares at Dec. 31, 2013 |  |  |  |  |  | (20,900,264)us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 20,900,000 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Shares awarded under stock compensation plans |  | 3,274 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation | 3,270 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 4 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Shares awarded under stock compensation plans, shares |  |  |  |  |  | 440,000 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Purchases of treasury stock |  | (53,046)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (53,046)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Purchases of treasury stock, shares |  |  |  |  |  |  | (2,256,000)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
Income tax benefit associated with stock compensation plans |  | 1,033 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 1,033 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Fair value of interest rate swap agreements, net of tax expense/benefit of $1,035, $6,514 and $1,769 in 2012, 2013 and 2014 respectively |  | 2,886 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax |  |  | 2,886 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Change in pension actuarial loss, net of tax benefit of $98, expense of $460, and benefit of $446 in 2012, 2013 and 2014 respectively |  | (728)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax |  |  | (728)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Restricted stock amortization |  | 7,675 sah_RestrictedStockAmortizationNetOfForfeitures | 7,675 sah_RestrictedStockAmortizationNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Other, shares |  |  |  |  |  | 23,000 us-gaap_StockholdersEquityOtherShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Net income (loss) |  | 97,217 us-gaap_NetIncomeLoss |  | 97,217 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Dividends ($0.10 per share) |  | (5,232)us-gaap_DividendsCommonStock |  | (5,232)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |  |
Ending Balance at Dec. 31, 2014 |  | $ 666,718 us-gaap_StockholdersEquity | $ 697,760 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 376,353 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (6,424)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 620 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ (401,712)us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 121 us-gaap_StockholdersEquity / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Ending Balance, Shares at Dec. 31, 2014 |  |  |  |  |  | 62,047,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  | 12,029,000 us-gaap_SharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Ending Balance, Treasury Shares at Dec. 31, 2014 |  |  |  |  |  | (23,156,433)us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 23,156,000 us-gaap_TreasuryStockShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |
[1] | 5.0% Convertible Senior Notes due 2029 which were extinguished during the third quarter ended September 30, 2012 (the “5.0% Convertible Notes”).
[2] | Paid-in capital amount represents a tax benefit related to the 5.0% Convertible Notes

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