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Benefit Plans (Summary Of Restricted Stock and Units Activity) (Details) - $ / shares
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Performance Contingent Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Nonvested, January 1 (in shares/awards) 190,244 197,624
Nonvested, January 1, weighted average grant date fair value (in dollars per share) $ 29.59 $ 25.35
Granted (in shares/awards) 0 90,806
Granted, weighted average grant date fair value (in dollars per share) $ 0.00 $ 32.55
Vested (in shares/awards) [1] 0 (98,186)
Vested, weighted average grant date fair value (in dollars per share) [1] $ 0.00 $ 23.79
Nonvested, September 30 (in shares/awards) 190,244 190,244
Nonvested, September 30, weighted average grant date fair value (in dollars per share) $ 29.59 $ 29.59
Performance Restricted Stock Unit [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Granted (in shares/awards) 68,585  
Granted, weighted average grant date fair value (in dollars per share) $ 33.96  
Forfeited (in shares/awards) (1,230)  
Forfeited, weighted average grant date fair value (in dollars per share) $ 33.90  
Nonvested, September 30 (in shares/awards) 67,355  
Nonvested, September 30, weighted average grant date fair value (in dollars per share) $ 33.96  
Performance Restricted Unit [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Granted (in shares/awards) 23,918  
Forfeited (in shares/awards) (1,261)  
Nonvested, September 30 (in shares/awards) 22,657  
Key Employee Performance Restricted Unit [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Granted (in shares/awards) 45,056  
Forfeited (in shares/awards) (2,016)  
Nonvested, September 30 (in shares/awards) 43,040  
Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Granted (in shares/awards) 58,790  
Forfeited (in shares/awards) (1,054)  
Nonvested, September 30 (in shares/awards) 57,736  
Restricted Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Granted (in shares/awards) 20,502  
Forfeited (in shares/awards) (1,082)  
Nonvested, September 30 (in shares/awards) 19,420  
2013 Grant [Member] | Performance Contingent Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Vested (in shares/awards) [1]   (98,186)
[1] In 2015, 98,186 performance contingent restricted shares granted in 2013 vested because the specified performance criteria for such shares were met.