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Stock-based Compensation (Schedule Of Share-based Payment Award Equity Instruments Other Than Options Valuation Assumptions) (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
RSUs Performance-Based Vesting [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date fair value $ 27.09 $ 26.27 $ 18.17
Market price on grant date 28.25 27.90 18.17
Expected annual dividend $ 0.60 $ 0.56  
Expected term (in years) 2 years 3 years  
Risk-free interest rate 2.02% 1.49%  
RSUs Service-Based Vesting [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Market price on grant date   $ 28.15  
Expected annual dividend $ 0.60 $ 0.56  
Expected term (in years)   4 years  
RSUs Service-Based Vesting [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date fair value 27.09 $ 25.35 18.17
Market price on grant date $ 28.25 $ 27.50 18.17
Expected term (in years) 2 years 3 years  
Risk-free interest rate 1.89% 1.60%  
RSUs Service-Based Vesting [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date fair value $ 27.33 $ 26.00 22.17
Market price on grant date $ 28.50   $ 22.17
Expected term (in years) 3 years    
Risk-free interest rate 2.02% 1.67%