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Preparation of Interim Financial Statements and Other Items - Deferred tax components (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Components of deferred tax assets and liabilities |  |
Investment in Cactus LLC | $ 179,265 |
Foreign loss carryforwards | 383 | $ 489
Deferred tax assets | 179,648 | 489
Valuation allowance | (383) | (489)
Deferred tax asset, net | 179,265 |
Foreign withholding taxes | 1,094 | 416
Deferred tax liability, net | $ 1,094 | $ 416

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