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Net Income Per Share
3 Months Ended
Mar. 31, 2012
Net Income Per Share [Abstract]  
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. These dilutive shares totaled 114,269 from the assumed settlement of dilutive nonvested restricted stock units at March 31, 2012. The number of additional shares is calculated by assuming that nonvested restricted stock units were settled and that the proceeds from such exercises were used to acquire shares of common stock at the average market price during the period. There were no dilutive effects for the period ended March 31, 2011. 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 periods ended March 31, 2012 and 2011:

 

     March 31, 2012      March 31, 2011  

Stock options

     887,672         1,786,031   

Restricted stock and units

     —           469,896