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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Nonvested, January 1 (in shares/awards) 190,244 197,624 317,844
Nonvested shares, January 1, weighted average grant date fair value (in dollars per share) $ 29.59 $ 25.35 $ 21.36
Granted (in shares/awards) 0 90,806 102,442
Granted, weighted average grant date fair value (in dollars per share) $ 0.00 $ 32.55 $ 26.89
Vested (in shares/awards) [1] 0 (98,186) (181,694)
Vested, weighted average grant date fair value (in dollars per share) [1] $ 0.00 $ 23.79 $ 20.46
Forfeited (in shares/awards) [2] 0 0 (40,968)
Forfeited, weighted average grant date fair value (in dollars per share) [2] $ 0.00 $ 0.00 $ 19.93
Nonvested, December 31 (in shares/awards) 190,244 190,244 197,624
Nonvested shares, December 31, weighted average grant date fair value (in dollars per share) $ 29.59 $ 29.59 $ 25.35
2013 Grant [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Vested (in shares/awards)   (98,186)  
2012 Grant [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Vested (in shares/awards)     (91,224)
2011 Grant [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Vested (in shares/awards)     (90,470)
[1] In 2015, 98,186 performance-contingent restricted shares granted in 2013 vested because the specified performance criteria for such shares were met. In 2014, 91,224 and 90,470 performance-contingent restricted shares granted in 2012 and 2011, respectively, vested because the specified performance criteria for such shares were met.
[2] The forfeitures during 2014 were primarily caused by retirements and terminations of participants.