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Shareholders' Equity (Restricted Stock Grants And Shares Surrendered To Satisfy Tax Withholdings) (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Stockholders' Equity Note [Abstract]        
Shares issued 1,754 4,692 157,082 149,880
Shares surrendered to AutoNation to satisfy tax withholding obligations in connection with the vesting of restricted stock 26,928 33,274 35,927 44,477