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Benefit Plans (Summary Of Performance Shares and Performance Units Vested Awards) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards) 99,438 98,186 91,224
Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards) 37,395 42,760 45,690
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  
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