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Earnings Per Share | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share Basic net income per share is calculated by dividing net income by the weighted average number of shares of common stock outstanding during the period. Diluted net income per share assumes the conversion of all potentially dilutive securities and is calculated by dividing net income by the sum of the weighted average number of shares of common stock outstanding plus all potentially dilutive securities. Dilutive common shares consist primarily of stock options and restricted stock awards. Dilutive shares related to the contingent consideration payable to former owners of BasX (Note 4) are included in the calculation of diluted weighted average shares once it is determinable that BasX will satisfy the post-closing earn-out milestones under the terms of the MIPA agreement. The shares will be included in basic weighted average share once they are legally issued and no longer contingent. The following table sets forth the computation of basic and diluted earnings per share:
| 2021 |  | 2020 |  | 2019
Numerator: | (in thousands, except share and per share data)
Net income | $ | 58,758 |  |  | $ | 79,009 |  |  | $ | 53,711 |
Denominator: |  |  |  |  |
Basic weighted average shares | 52,404,199 |  |  | 52,168,679 |  |  | 52,079,865 |
Effect of dilutive shares related to stock based compensation 1 | 1,301,698 |  |  | 892,490 |  |  | 555,550 |
Effect of dilutive shares related contingent consideration 2 | 23,092 |  |  | — |  |  | — |
Diluted weighted average shares | 53,728,989 |  |  | 53,061,169 |  |  | 52,635,415 |
Earnings per share: |  |  |  |  |
Basic | $ | 1.12 |  |  | $ | 1.51 |  |  | $ | 1.03 |
Dilutive | $ | 1.09 |  |  | $ | 1.49 |  |  | $ | 1.02 |
Anti-dilutive shares: |  |  |  |  |
Shares | 304,029 |  |  | 364,787 |  |  | 1,868,087 |
1 Dilutive shares related to stock options, restricted stock, PSUs and Key Employee Awards (Note 17)
2 Dilutive shares related contingent shares issued to former owners of BasX (Note 4)

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