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Earnings Per Common Share (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Diluted weighted average number of common shares outstanding | In accordance with the treasury stock method, the Company has included the following common equivalent shares in the calculation of diluted weighted average number of common shares outstanding for the three months ended March 31, relating to outstanding stock options and restricted stock units:
| 2018 |  | 2017
Three months ended | 627,324 |  |  | 653,949 |

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