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Net Income Per Common Share | 6 Months Ended
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Jun. 30, 2021
Net Income Per Common Share |
Net Income Per Common Share | 4. Net Income Per Common 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 and restricted stock awards, 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 | ​ | Six Months Ended
​ | ​ | ​ | June 30, | ​ | June 30,
​ |  |  | 2021 |  | 2020 |  | 2021 |  | 2020
Denominator: |  |  |  |  |  |  |  |  |
Basic weighted average shares outstanding |  |  | 45,490 |  | 46,893 |  | 45,810 |  | 47,174
Effect of dilutive stock options and restricted stock |  |  | 92 |  | 258 |  | 154 |  | 283
Diluted weighted average shares outstanding |  |  | 45,582 |  | 47,151 |  | 45,964 |  | 47,457
​ Diluted weighted average shares outstanding excludes the incremental effect of unvested restricted stock and shares that would be issued upon the assumed exercise of stock options in accordance with the treasury stock method. For the three month periods ended June 30, 2021 and 2020, approximately 1 and 81, respectively, and for the six month perioded ended June 30, 2021 and 2020, approximately 2 and 182, respectively, of the Company’s restricted stock awards outstanding were excluded from the calculation of diluted earnings per share as their inclusion would have been anti-dilutive. These restricted stock awards could be dilutive in the future.

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