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Net Income (Loss) Per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Net Income (Loss) Per Share | 14. Net Income (Loss) Per Share The following is a reconciliation of the average shares outstanding used to compute basic and diluted earnings per share:
|  | 2020 |  |  | 2019 |  |  | 2018 |
Basic weighted average common shares outstanding |  |  | 34,691,063 |  |  |  | 35,487,358 |  |  |  | 35,513,162 |
Effect of dilutive securities - stock awards |  |  | — |  |  |  | 154,442 |  |  |  | — |
Diluted weighted average common shares outstanding |  |  | 34,691,063 |  |  |  | 35,641,800 |  |  |  | 35,513,162 |
Equity incentive instruments for which total employee proceeds from exercise exceed the average fair value of the same equity incentive instrument over the period have an anti-dilutive effect on earnings per share during periods with net earnings, and accordingly, are excluded from diluted weighted average common shares outstanding. Anti-dilutive equity instruments of 1,527,645 common shares were excluded from the computation of diluted net earnings per share for the years ended December 31, 2019. Due to the net loss during the years ended December 31, 2020 and 2018, the assumed exercise of all equity incentive instruments was anti-dilutive and, therefore, not included in the diluted loss per share calculation for this period.

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