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Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |  |  |
Gross gains realized | $ 421 | $ 400 | $ 9
Gross losses realized | 0 | (449) | 0
Proceeds from sales | $ 20,221 | $ 357,976 | $ 1,451

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