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Benefit Plans (Summary Of Performance Shares Activity) (Details) - Performance Shares [Member] - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Nonvested, January 1 (in shares/awards) [1] 144,424 139,940
Granted (in shares/awards) [1] 45,403 51,221
Vested (in shares/awards) [1] (45,612) (45,235)
Forfeited (in shares/awards) [1] 0 (1,502)
Nonvested, June 30 (in shares/awards) [1] 144,215 144,424
2012 Grant [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Vested (in shares/awards) (45,612)  
Vested percentage of the target 167.50%  
Aggregate payout value $ 5.1  
Payout - cash $ 3.2  
Payout - common stock shares issued (in shares) 10,975  
2011 Grant [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Vested (in shares/awards)   (45,235)
Vested percentage of the target   147.50%
Aggregate payout value   $ 3.4
Payout - cash   $ 2.9
Payout - common stock shares issued (in shares)   4,810
[1] Share amounts represent the target number of performance shares.