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Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Examination [Line Items] |  |  |  |  |
Reduced provision for income taxes |  |  | $ 8,300 |  |
Provision for income taxes |  | $ 14,999 | 8,279 | $ 33,553 | $ 30,100
Additions based on tax positions related to prior years | $ 26,400 |  |  |  |
Tax Year 2016 |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Provision for income taxes | 6,100 |  |  |  |
Tax Year 2017 |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Provision for income taxes | 8,500 |  |  |  |
Tax Year 2018 |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Provision for income taxes | 11,900 |  |  |  |
Total Tax Years 2016-2018 |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Provision for income taxes | $ 26,500 |  |  |  |
Internal Revenue Service (IRS) |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Refund claims allowed in Income tax examination |  |  | $ 8,900 |  | $ 8,900

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