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Income Taxes - Unrecognized Tax Benefit Narrative (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Income taxes |  |  |  |
Unrecognized tax benefits | $ 18,892 | $ 18,453 | $ 19,560 | $ 21,400
Unrecognized tax benefits, Income tax penalties and interest accrued | 2,100 | 2,100 | 2,200 |
Income tax interest and penalty expenses | $ (100) | (100) | 700 |
Number of state audits | item | 2 |  |  |
Amount refunded |  | 2,400 | 1,700 |
Decrease in uncertain tax positions |  | 4,400 | 3,500 |
Potential decrease in unrecognized tax benefit | $ 2,700 |  |  |
Exterran Corporation | Spinoff |  |  |  |
Income taxes |  |  |  |
Indemnification asset | 7,868 | 8,508 |  |
Continuing Operations |  |  |  |
Income taxes |  |  |  |
Unrecognized tax benefits that would impact tax rate if recognized | 2,900 | 3,200 | 6,900 |
Discontinued Operations |  |  |  |
Income taxes |  |  |  |
Unrecognized tax benefits that would impact tax rate if recognized | $ 7,900 | $ 8,300 | $ 6,900 |

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