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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Jul. 16, 2018 | Feb. 11, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Common Stock, Shares, Outstanding |  |  | 74,889,772 |
Numerator: |  |  |  |
Net income attributable to Cactus Inc. | $ 18,672 | $ 34,759 |  |
Denominator: |  |  |  |
Weighted average Class A Shares Outstanding - basic | 35,821 | 30,182 |  |
Effect of dilutive shares | 408 | 340 |  |
Weighted average Class A Shares Outstanding - diluted | 36,229 | 30,522 |  |
Earnings per Class A Share - basic | $ 0.52 | $ 1.15 |  |
Earnings per Class A Share - diluted | $ 0.52 | $ 1.14 |  |
Class A Common Stock |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Common Stock, Shares, Outstanding | 37,646,562 | 37,646,562 | 37,646,562 | 0
Denominator: |  |  |  |
Weighted average Class A Shares Outstanding - diluted | 36,229,000 | 30,522,000 |  |
Earnings per Class A Share - basic | $ 0.52 | $ 1.15 |  |
Earnings per Class A Share - diluted | $ 0.52 | $ 1.14 |  |
Class B Common Stock |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Common Stock, Shares, Outstanding | 37,243,210 | 37,243,210 | 37,243,210 | 0
Denominator: |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 37,243,210 |  |

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