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Shareholders' Equity (Restricted Stock Grants And Shares Surrendered To Satisfy Tax Withholdings) (Details) - shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Stockholders' Equity Note [Abstract]    
Shares issued 138,424 155,328
Shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the vesting of restricted stock 8,760 8,999