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Shareholders' Equity (Restricted Stock Grants And Shares Surrendered To Satisfy Tax Withholdings) (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Stockholders' Equity Note [Abstract]        
Shares issued 0 2,360 138,424 159,442
Shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the vesting of restricted stock 4,788 500 37,673 36,427