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Income Taxes - Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |
Increase (decrease) before consideration of adoption of ASC 842 | $ (27,913) | $ 60,376
Increase due to the adoption of ASC 842 | 0 | 13,790
Other decrease during the year | 0 | (1,680)
Total increase (decrease) in valuation allowance | $ (27,913) | $ 72,486

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