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Net Income Per Common Share
9 Months Ended
Sep. 30, 2011
Net Income Per Common Share [Abstract] 
Net Income Per Common Share
4. Net Income Per Common Share
Basic net income per common share is calculated by dividing net income available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted earnings per common share reflects the assumed conversion of all potentially dilutive securities, consisting of stock options, for which the estimated fair value exceeds the exercise price, less shares which could have been purchased with the related proceeds, unless anti-dilutive. For employee equity awards, repurchased shares are also included for any unearned compensation adjusted for tax.
The table below reflects the calculation of the weighted average number of common shares outstanding, on an as if converted basis, used in computing basic and diluted earnings per common share.
                                 
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
    2011     2010     2011     2010  
Denominator:
                               
 
                               
Basic common shares outstanding
    44,302       45,746       44,845       45,715  
Effect of dilutive stock options and restricted stock
    485       605       448       698  
 
                       
Diluted common shares outstanding
    44,787       46,351       45,293       46,413  
 
                       
Diluted weighted average shares outstanding exclude the incremental effect of shares that would be issued upon the assumed exercise of stock options. For the nine months ended September 30, 2011 and 2010, approximately 2,878 and 803, respectively, of the University’s stock options outstanding were excluded from the calculation of diluted earnings per share as their inclusion would have been anti-dilutive. These options could be dilutive in the future.