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Share-Based Compensation (Schedule Of Transactions Of Contingent Awards) (Details) - Performance Shares - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested, Other Than Options 1,184,773    
Nonvested, Weighted Average Grant Date Fair Value $ 19.52    
Granted, Other Than Options 514,338 660,750 647,305
Granted, Weighted Average Grant Date Fair Value $ 22.51    
Forfeited, Other Than Options (64,393)    
Forfeited, Weighted Average Grant Date Fair Value $ 26.79    
Vested, Other Than Options 0    
Vested, Weighted Average Grant Date Fair Value $ 0.00    
Nonvested, Other Than Options 1,634,718 1,184,773  
Nonvested, Weighted Average Grant Date Fair Value $ 20.45 $ 19.52