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Marketable Securities - Narrative (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] |  |  |
Marketable securities, realized gains | $ 474 | $ 483 | $ 317
Marketable securities, realized loss | $ 912 | $ 151 | $ 565

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- Definition Marketable Securities, Realized Loss + References No definition available. + Details
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