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Stock Compensation (Summary Of Restricted Stock Awards And PSUs Activity During The Period) (Details) - Restricted Stock Awards And PSUs [Member] - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted Stock Awards and PSU's, Non-vested at beginning of period 4,653    
Restricted Stock Awards and PSU's, Granted 2,176 1,800 1,800
Restricted Stock Awards, Vested (1,253)    
Restricted Stock Awards and PSU's, Forfeited (209)    
Restricted Stock Awards and PSU's, Non-vested at end of period 5,367 4,653  
Weighted average grant-date fair value of Restricted Stock Awards and PSU's, Non-vested at beginning of period (in dollars per share) $ 40.03    
Weighted average grant-date fair value of Restricted Stock Awards and PSU's, Granted (in dollars per share) 44.38 $ 33.31 $ 46.73
Weighted average grant-date fair value of Restricted Stock Awards and PSU's, Vested (in dollars per share) 40.74    
Weighted average grant-date fair value of Restricted Stock Awards and PSU's, Forfeited (in dollars per share) 40.89    
Weighted average grant-date fair value of Restricted Stock Awards and PSU's, Non-vested at end of period (in dollars per share) $ 41.60 $ 40.03