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Income Tax Contingencies (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |  |  |  |
Net interest and penalties expense | $ 195 | $ (198) | $ 153 | $ 422 |
Accrued interest | 3,663 |  | 3,663 |  | $ 3,432
Accrued penalties | 1,405 |  | 1,405 |  | 1,645
Unrecognized tax benefits related to uncertain tax positions | 134,110 |  | 134,110 |  | 135,910
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate | $ 132,992 |  | $ 132,992 |  | $ 134,473

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