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Earnings Per Share
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Earnings Per Share
22. Earnings Per Share
 
The following table sets forth the computation of basic and diluted earnings per share:
 
Year Ended December 31
 
2012
  
2011
  
2010
 
Numerator:
         
Net income (in thousands)
 $44,862  $38,827  $33,034 
              
Denominator:
            
Basic earnings per share:
            
Weighted average shares
  15,466,274   15,313,081   15,233,858 
Diluted earnings per share:
            
Dilutive effect of equity grants
  54,243   51,112   24,936 
Adjusted weighted average shares
  15,520,517   15,364,193   15,258,794 
              
Earnings per share:
            
Basic earnings per share
 $2.90  $2.54  $2.17 
Diluted earnings per share
  2.89   2.53   2.16 
 
At December 31, 2012, 89,746 stock options at a weighted average price of $38.95 were outstanding and were not used in the computation of diluted earnings per share because their exercise price was greater than the average market value of the common stock. Unvested restricted stock grants were also used in the calculation of diluted earnings per share based on the treasury method. At December 31, 2011, 323,255 stock options at a price of $33.02 were outstanding and were not used in the computation of diluted earnings per share. At December 31, 2010, 422,972 stock options at a price of $32.36 were outstanding and were not used in the computation of diluted earnings per share.