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Net Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2011
Earnings Per Share [Abstract]  
Reconciliation of the number of weighted shares used to compute basic and diluted net earnings per share
A reconciliation of the number of weighted shares used to compute basic and diluted net earnings per share for the three and six months ended June 30, 2011 and 2010, are illustrated below:

   
Three Months Ended
  
Six Months Ended
 
   
June 30,
  
June 30,
 
   
2011
  
2010
  
2011
  
2010
 
Weighted average common shares outstanding for basic EPS
  30,462,593   29,929,176   30,419,040   29,871,425 
Effect of dilutive securities: employee stock options
  447,537   321,226   440,716   299,778 
Adjusted weighted average common shares outstanding for diluted EPS
  30,910,130   30,250,402   30,859,756   30,171,203 
                  
Weighted options to purchase a total of 92,049 and 87,000 shares of the Company’s common stock for the three months ended June 30, 2011 and 2010, respectively, and 79,677 and 86,575 shares of the Company’s common stock for the six months ended June 30, 2011 and 2010, respectively, were excluded from the calculations of fully diluted earnings per share, in each case because the effect on fully diluted earnings per share for the period was antidilutive.