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Earnings Per Share | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Earnings Per Share | 10. Earnings Per Share Basic earnings 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.
|  | Year Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic common shares outstanding |  |  | 45,975 |  |  |  | 45,538 |  |  |  | 44,731 |
Effect of dilutive stock options and restricted stock |  |  | 1,306 |  |  |  | 1,468 |  |  |  | 1,400 |
Diluted common shares outstanding |  |  | 47,281 |  |  |  | 47,006 |  |  |  | 46,131 |
Diluted weighted average shares outstanding exclude the incremental effect of shares that would be issued upon the assumed exercise of stock options and vesting of restricted stock. For each of the years ended December 31, 2015, 2014 and 2013, approximately 385, 174 and 134, respectively, of the University’s stock options and restricted stock awards outstanding were excluded from the calculation of diluted earnings per share as their inclusion would have been anti-dilutive. These options and restricted stock awards could be dilutive in the future.

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