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Benefit Plans (Summary Of Restricted Stock Activity) (Details) - $ / shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 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) 95,122 98,812
Nonvested, January 1, weighted average grant date fair value (in dollars per share) $ 59.17 $ 50.69
Granted (in shares/awards) 0 45,403
Granted, weighted average grant date fair value (in dollars per share) $ 0.00 $ 65.09
Vested (in shares/awards) [1] 0 (49,093)
Vested, weighted average fair value (in dollars per share) [1] $ 0.00 $ 47.58
Nonvested, March 31 (in shares/awards) 95,122 95,122
Nonvested, March 31, weighted average grant date fair value (in dollars per share) $ 59.17 $ 59.17
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) 33,776  
Granted, weighted average grant date fair value (in dollars per share) $ 67.85  
Forfeited (in shares/awards) (615)  
Forfeited, weighted average grant date fair value (in dollars per share) $ 67.80  
Nonvested, March 31 (in shares/awards) 33,161  
Nonvested, March 31, weighted average grant date fair value (in dollars per share) $ 67.85  
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) 11,959  
Nonvested, March 31 (in shares/awards) 11,959  
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) 22,528  
Granted, weighted average grant date fair value (in dollars per share) $ 67.80  
Nonvested, March 31 (in shares/awards) 22,528  
Nonvested, March 31, weighted average grant date fair value (in dollars per share) $ 67.80  
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) 28,952  
Forfeited (in shares/awards) (527)  
Nonvested, March 31 (in shares/awards) 28,425  
Restricted Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Granted (in shares/awards) 10,251  
Forfeited (in shares/awards) 0  
Nonvested, March 31 (in shares/awards) 10,251  
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]   (49,093)
[1] In 2015, 49,093 performance contingent restricted shares granted in 2013 vested because the specified performance criteria for such shares were met.