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Income Taxes - Valuation Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
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