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Benefit Plans (Summary Of Performance Shares and Performance Units Vested Awards) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards) 90,806 99,438 98,186
Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards) 31,910 37,395 42,760
2015 Grant [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards) 90,806    
Vested percentage of the target 137.50%    
Cash and stock payout value $ 5.3    
Cash payout value $ 4.9    
Common stock shares from vested performance shares (in shares) 5,078    
2015 Grant [Member] | Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards) 31,910    
Vested percentage of the target 137.50%    
Cash and stock payout value $ 1.4    
Cash payout value $ 1.4    
2014 Grant [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards)   99,438  
Vested percentage of the target   147.50%  
Cash and stock payout value   $ 5.6  
Cash payout value   $ 5.1  
Common stock shares from vested performance shares (in shares)   5,185  
2014 Grant [Member] | Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards)   37,395  
Vested percentage of the target   147.50%  
Cash and stock payout value   $ 1.5  
Cash payout value   $ 1.5  
2013 Grant [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards)     98,186
Vested percentage of the target     165.00%
Cash and stock payout value     $ 5.1
Cash payout value     $ 2.9
Common stock shares from vested performance shares (in shares)     22,408
2013 Grant [Member] | Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards)     42,760
Vested percentage of the target     165.00%
Cash and stock payout value     $ 1.7
Cash payout value     $ 1.7