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Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounting Policies [Abstract] |  |  |  |
Total amount of unrecognized tax benefits relating to uncertain tax positions | $ 33,219 | $ 40,878 | $ 41,110 | $ 36,229
Unrecognized tax benefits, decrease from settlements | (3,300) |  |  |
Unrecognized tax benefits, decrease from expiration of statutes of limitations | (8,700) |  |  |
Increase (decrease) in the total amount of unrecognized tax benefits relating to uncertain tax positions | (7,700) |  |  |
Unrecognized tax benefits, increase from current period tax positions | 4,398 | 7,708 | 6,231 |
Increase in reserves for uncertain tax positions taken in prior years | 0 | $ 1,200 | $ 9,377 |
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months (up to) | $ 11,900 |  |  |

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