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Stock Option And Stock Award Plans (Summary Of Stock Options Outstanding) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Options      
Number of Options, Outstanding, Beginning Balance 881,513 1,164,120 1,046,800
Number of Options, Granted 0 0 181,476
Number of Options, Forfeited and Expired (246,394) (60,207) (22,581)
Number of Options, Exercised (134,200) (222,400) (41,575)
Number of Options, Outstanding, Ending Balance 500,919 881,513 1,164,120
Weighted Average      
Weighted Average Option Exercise Price/Share, Outstanding, Beginning Balance $ 20.22 $ 19.59 $ 19.06
Weighted Average Option Exercise Price/Share, Granted 0.00 0.00 22.41
Weighted Average Option Exercise Price/Share, Forfeited and Expired 18.90 22.30 21.42
Weighted Average Option Exercise Price/Share, Exercised 17.23 16.34 17.55
Weighted Average Option Exercise Price/Share, Outstanding, Ending Balance 21.67 20.22 19.59
Minimum      
Option Exercise Price/Share Range      
Exercise Price, Outstanding, Beginning Balance 17.13 14.06 14.06
Exercise Price, Granted 0 0 19.84
Exercise Price, Forfeited and Expired 17.13 17.13 15.8
Exercise Price, Exercised 17.13 14.06 15.8
Exercise Price, Outstanding, Ending Balance 17.13 17.13 14.06
Maximum      
Option Exercise Price/Share Range      
Exercise Price, Outstanding, Beginning Balance 30.01 30.01 30.01
Exercise Price, Granted 0 0 22.49
Exercise Price, Forfeited and Expired 30.01 30.01 24.84
Exercise Price, Exercised 19.84 19.84 19.84
Exercise Price, Outstanding, Ending Balance $ 30.01 $ 30.01 $ 30.01