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Shareholders' Equity (Restricted Stock Grants And Shares Surrendered To Satisfy Tax Withholdings) (Details)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Stockholders' Equity Note [Abstract]    
Shares issued 155,328us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross 145,188us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
Shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the vesting of restricted stock 8,999us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation 11,203us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation