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Equity Investments - Change in Fair Value of Equity Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Net change in fair value recorded during the period on equity investments with readily determinable fair value $ (484) $ 354
Net change in fair value recorded on equity investments sold during the period 0 0
Net change in fair value on equity investments with readily determinable fair values $ (484) $ 354