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Common and Common Equivalent Shares:
 3 Months Ended
Mar. 31, 2013
Common and Common Equivalent Shares:
7. Common and Common Equivalent Shares:

Basic net income per share is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Diluted net income per share is calculated by dividing net income by the weighted average number of common and potential common shares outstanding during the applicable period. Potential common shares consist of outstanding stock options and non-vested restricted and deferred stock calculated using the treasury stock method. Under the treasury stock method, the Company includes the assumed excess tax benefits related to the potential exercise or vesting of its stock-based awards using the difference between the average market price for the applicable period less the option price, if any, and the fair value of the stock-based award on the date of grant multiplied by the applicable tax rate.

The calculation of shares used in the basic and diluted net income per share calculation for the three months ended March 31, 2013 and 2012 is as follows (in thousands):

 

     Three Months Ended
March  31,		  
     2013      2012  

Weighted average number of common shares outstanding

      49,309         48,269   

Weighted average number of dilutive common share equivalents

      1,083         1,130   
  

 

 

     

 

 

  

Weighted average number of common and common equivalent shares outstanding

      50,392         49,399   
  

 

 

     

 

 

  

Antidilutive securities not included in the dilutive earnings per share calculation

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