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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Summary Of Significant Accounting Policies [Abstract]  
Schedule Of Diluted Earnings Per Share Computed Using Weighted Average Common And Potentially Dilutive Common Equivalent Shares Outstanding
  2012 2011 2010
Weighted average shares outstanding used to
compute basic earnings per share		 32,032,343 31,931,962 32,291,556
Incremental shares attributable to stock
options and restricted stock		 160,233 281,212 280,565
Shares used to compute diluted earnings
per share		 32,192,576 32,213,174 32,572,121
Schedule Of Assumptions For Valuing Stock Options Granted
    2012     2011     2010  
Dividend yield   .9 %   .9 %   .9 %
Weighted average volatility percentage   48.7 %   46.4 %   46.6 %
Weighted average risk-free interest rate   1.0 %   2.5 %   2.7 %
Holding period (years):                  
Officers   6.0     6.0     6.0  
Management   5.0     5.0     5.0  
Weighted average excercise price at date
of grant (also weighted average market
price at date of grant):		                  
Officers $ 19.30   $ 19.84   $ 17.18  
Management   19.40     19.73     17.13  
Schedule Of Stock Options Granted And Related Estimated Fair Value At Date Of Grant
    2012   2011   2010
Stock options granted (number of shares):            
Officers   99,600   140,500   190,000
Management   82,500   95,300   126,000
Total   182,100   235,800   316,000
Estimated weighted average fair value of            
options per share at date of grant:            
Officers $ 8.07 $ 8.55 $ 7.47
Management   7.81   8.03   7.00
Total estimated fair value of stock
options granted (in thousands)		 $ 1,449 $ 1,966 $ 2,301