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Benefit Plans (Summary Of Performance Shares and Units Vested Awards) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards) 98,186 91,224 90,470
Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards) 42,760 45,690 41,502
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    
2012 Grant [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards)   91,224  
Vested percentage of the target   167.50%  
Cash and stock payout value   $ 5.1  
Cash payout value   $ 3.2  
Common stock shares from vested performance shares (in shares)   21,950  
2012 Grant [Member] | Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards)   45,690  
Vested percentage of the target   167.50%  
Cash and stock payout value   $ 1.6  
Cash payout value   $ 1.6  
2011 Grant [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards)     90,470
Vested percentage of the target     147.50%
Cash and stock payout value     $ 3.4
Cash payout value     $ 2.9
Common stock shares from vested performance shares (in shares)     9,620
2011 Grant [Member] | Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards)     41,502
Vested percentage of the target     147.50%
Cash and stock payout value     $ 1.2
Cash payout value     $ 1.2