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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 earnings per share of Class A common stock is calculated by dividing the net income attributable to Cactus Inc. during the period by the weighted average number of shares of Class A common stock outstanding during the same period. Diluted earnings per share of Class A common stock is calculated by dividing the net income attributable to Cactus Inc. during that period by the weighted average number of common shares outstanding assuming all potentially dilutive shares were issued. We use the if-converted method to determine the potential dilutive effect of outstanding CW Units (and corresponding shares of outstanding Class B common stock), the treasury stock method to determine the potential dilutive effect of unvested restricted stock units assuming that the proceeds will be used to purchase shares of Class A common stock and the contingently issuable share method to determine the potential dilutive effect of unvested performance stock units. The following table summarizes the basic and diluted earnings per share calculations:
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Numerator: |  |  |  |  |
Net income attributable to Cactus Inc.—basic | $ | 49,593 |  |  | $ | 34,446 |  |  | $ | 85,612 |
Net income attributable to non-controlling interest(1) | 13,744 |  |  | 19,934 |  |  | 56,012 |
Net income attributable to Cactus Inc.—diluted(1) | $ | 63,337 |  |  | $ | 54,380 |  |  | $ | 141,624 |
Denominator: |  |  |  |  |
Weighted average Class A shares outstanding—basic | 55,398 |  |  | 47,457 |  |  | 44,983 |
Effect of dilutive shares | 20,709 |  |  | 28,038 |  |  | 30,370 |
Weighted average Class A shares outstanding—diluted | 76,107 |  |  | 75,495 |  |  | 75,353 |
Earnings per Class A share—basic | $ | 0.90 |  |  | $ | 0.73 |  |  | $ | 1.90 |
Earnings per Class A share—diluted(1) | $ | 0.83 |  |  | $ | 0.72 |  |  | $ | 1.88 |
(1)The numerator is adjusted in the calculation of diluted earnings per share under the if-converted method to include net income attributable to the non-controlling interest calculated as its pre-tax income adjusted for a corporate effective tax rate of 27.0% for the year ended December 31, 2021 and 24.0% for the years ended December 31, 2020 and 2019.

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