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Income Taxes - Unrecognized Tax Benefit Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income taxes |  |  |  |
Unrecognized tax benefits | $ 19,594 | $ 18,892 | $ 18,453 | $ 19,560
Unrecognized tax benefits, Income tax penalties and interest accrued | 2,200 | 2,100 | 2,100 |
Income tax interest and penalty expenses | 100 | (100) | (100) |
Amount refunded |  |  | 2,400 |
Decrease in uncertain tax positions |  |  | 4,400 |
Potential decrease in unrecognized tax benefit | 2,600 |  |  |
Exterran Corporation | Spinoff |  |  |  |
Income taxes |  |  |  |
Indemnification asset, discontinued operations | 7,868 | 7,868 |  |
Continuing Operations |  |  |  |
Income taxes |  |  |  |
Unrecognized tax benefits that would impact tax rate if recognized | 2,100 | 2,900 | 3,200 |
Discontinued Operations. |  |  |  |
Income taxes |  |  |  |
Unrecognized tax benefits that would impact tax rate if recognized | $ 7,900 | $ 7,900 | $ 8,300 |

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