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Benefit Plans (Summary Of Performance Contingent Restricted Stock Activity) (Details) - Performance-Contingent Restricted Stock [Member] - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Nonvested, January 1 (in shares/awards) 98,812 158,922 211,651
Nonvested shares, January 1, weighted average fair value (in dollars per share) $ 50.69 $ 42.71 $ 32.42
Granted (in shares/awards) 45,403 51,221 49,093
Granted, weighted average fair value (in dollars per share) $ 65.09 $ 53.77 $ 47.58
Vested (in shares/awards) [1] (49,093) (90,847) 0
Vested, weighted average fair value (in dollars per share) [1] $ 47.58 $ 40.91 $ 0.00
Forfeited (in shares/awards) [2] 0 (20,484) (101,822)
Forfeited, weighted average fair value (in dollars per share) [2] $ 0.00 $ 39.85 $ 23.67
Nonvested, December 31 (in shares/awards) 95,122 98,812 158,922
Nonvested shares, December 31, weighted average fair value (in dollars per share) $ 59.17 $ 50.69 $ 42.71
2013 Grant [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Vested (in shares/awards) (49,093)    
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)  
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)  
2009 Grant [Member] | Performace Criteria Not Met [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Forfeited (in shares/awards)     (101,822)
[1] In 2015, 49,093 performance-contingent restricted shares granted in 2013 vested because the specified performance criteria for such shares were met. In 2014, 45,612 and 45,235 performance-contingent restricted shares granted in 2012 and 2011, respectively, vested because the specified performance criteria for such shares were met.
[2] In 2013, 101,822 performance-contingent restricted shares granted in 2009 were forfeited because the specified performance criteria for such shares were not met. The forfeitures during 2014 were primarily caused by retirements and terminations of participants.