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Net Income Per Share
 9 Months Ended
Sep. 30, 2012
Net Income Per Share

4. Net Income Per Share

Basic net income per share is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding. Common shares outstanding includes common stock issued less treasury shares plus restricted stock units for which no future service is required as a condition to the delivery of the underlying common stock. Diluted net income per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding plus all dilutive potential common shares outstanding during the period. All dilutive potential common shares outstanding consider common stock deliverable pursuant to stock options and nonvested restricted stock units. The following table presents securities outstanding that could potentially dilute basic EPS in the future that were not included in the computation of diluted EPS because they were antidilutive for the three and nine month periods ended September 30, 2012 and 2011:

 

     Three months ended September 30,      Nine months ended September 30,  
     2012      2011      2012      2011  

Stock options

      0         1,718,735         846,185         1,742,167   

Restricted stock units

      0         461,589         71,550         465,465