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Equity - Redemptions and Dividends (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 19, 2019 | Oct. 29, 2019 | Mar. 21, 2019 | Mar. 20, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Redemptions of CW Units |  |  |  |  |  |  |  |
CW Unit redemptions |  |  |  |  |  |  | (804) | (7)
Dividends declared per common share |  |  |  |  |  |  | $ 0.09 |
Cactus LLC |  |  |  |  |  |  |  |
Redemptions of CW Units |  |  |  |  |  |  |  |
Increase to equity in non-controlling interest |  |  |  |  |  |  | $ 48.7 |
March 2019 Secondary Offering |  |  |  |  |  |  |  |
Redemptions of CW Units |  |  |  |  |  |  |  |
CW Unit redemptions |  |  |  | 8,500 | (8,474) |  |  |
March 2019 Secondary Offering | Other income (expense) |  |  |  |  |  |  |  |
Redemptions of CW Units |  |  |  |  |  |  |  |
Offering expenses |  |  |  |  | $ 1.0 |  |  |
Class A Common Stock |  |  |  |  |  |  |  |
Redemptions of CW Units |  |  |  |  |  |  |  |
Dividends declared per common share |  | $ 0.09 |  |  |  | $ 0.09 | $ 0.09 |
Dividend paid | $ 4.2 |  |  |  |  |  |  |
Class A Common Stock | March 2019 Secondary Offering |  |  |  |  |  |  |  |
Redemptions of CW Units |  |  |  |  |  |  |  |
Number of shares issued |  |  | 8,500 |  |  |  | 800 |
Number of shares sold by certain other selling stockholders |  |  |  | 26 |  |  |  |
Class B Common Stock |  |  |  |  |  |  |  |
Redemptions of CW Units |  |  |  |  |  |  |  |
Number of shares canceled |  |  |  |  |  |  | 800 |

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