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Stock Option And Stock Award Plans (Summary Of Stock Options Outstanding) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Number of Options      
Number of Options, Outstanding, Beginning Balance 1,076,700 1,121,500 1,017,275
Number of Options, Granted 184,700 182,100 235,800
Number of Options, Forfeited and Expired (34,000) (50,300) (51,800)
Number of Options, Exercised (180,600) (176,600) (79,775)
Number of Options, Outstanding, Ending Balance 1,046,800 1,076,700 1,121,500
Weighted Average      
Weighted Average Option Exercise Price/Share, Outstanding, Beginning Balance $ 17.81 $ 17.40 $ 16.64
Weighted Average Option Exercise Price/Share, Granted $ 24.97 $ 19.34 $ 19.79
Weighted Average Option Exercise Price/Share, Forfeited and Expired $ 21.10 $ 19.34 $ 16.78
Weighted Average Option Exercise Price/Share, Exercised $ 17.32 $ 16.33 $ 15.11
Weighted Average Option Exercise Price/Share, Outstanding, Ending Balance $ 19.06 $ 17.81 $ 17.40
Minimum
      
Option Exercise Price/Share Range      
Exercise Price, Outstanding, Beginning Balance $ 14.06 $ 14.06 $ 13.95
Exercise Price, Granted $ 24.84 $ 18.51 $ 16.87
Exercise Price, Forfeited and Expired $ 15.11 $ 15.8 $ 13.95
Exercise Price, Exercised $ 14.27 $ 14.72 $ 13.95
Exercise Price, Outstanding, Ending Balance $ 14.06 $ 14.06 $ 14.06
Maximum
      
Option Exercise Price/Share Range      
Exercise Price, Outstanding, Beginning Balance $ 19.84 $ 19.84 $ 19.52
Exercise Price, Granted $ 30.01 $ 19.4 $ 19.84
Exercise Price, Forfeited and Expired $ 24.84 $ 19.84 $ 19.84
Exercise Price, Exercised $ 19.84 $ 18.12 $ 18.12
Exercise Price, Outstanding, Ending Balance $ 30.01 $ 19.84 $ 19.84