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Stock Option And Stock Award Plans (Summary Of Stock Options Outstanding) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of Options      
Number of Options, Outstanding, Beginning Balance 500,919 881,513 1,164,120
Number of Options, Granted 209,551 0 0
Number of Options, Forfeited and Expired (60,685) (246,394) (60,207)
Number of Options, Exercised (41,265) (134,200) (222,400)
Number of Options, Outstanding, Ending Balance 608,520 500,919 881,513
Weighted Average      
Weighted Average Option Exercise Price/Share, Outstanding, Beginning Balance $ 21.67 $ 20.22 $ 19.59
Weighted Average Option Exercise Price/Share, Granted 15.65 0.00 0.00
Weighted Average Option Exercise Price/Share, Forfeited and Expired 21.42 18.90 22.30
Weighted Average Option Exercise Price/Share, Exercised 19.84 17.23 16.34
Weighted Average Option Exercise Price/Share, Outstanding, Ending Balance 19.75 21.67 20.22
Minimum      
Option Exercise Price/Share Range      
Exercise Price, Outstanding, Beginning Balance 17.13 17.13 14.06
Exercise Price, Granted 15.65 0 0
Exercise Price, Forfeited and Expired 17.13 17.13 17.13
Exercise Price, Exercised 19.84 17.13 14.06
Exercise Price, Outstanding, Ending Balance 15.65 17.13 17.13
Maximum      
Option Exercise Price/Share Range      
Exercise Price, Outstanding, Beginning Balance 30.01 30.01 30.01
Exercise Price, Granted 15.65 0 0
Exercise Price, Forfeited and Expired 30.01 30.01 30.01
Exercise Price, Exercised 19.84 19.84 19.84
Exercise Price, Outstanding, Ending Balance $ 24.84 $ 30.01 $ 30.01