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Fair Value of Assets and Liabilities - Schedule of Marketable Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Fair Value Disclosures [Abstract]        
Realized gains and losses on equity securities sold $ 0 $ (62,272) $ 0 $ (41,436)
Unrealized gains and losses on equity securities held 11,974 (2,176) 2,031 (80)
Gains and losses on equity securities, net $ 11,974 $ (64,448) $ 2,031 $ (41,516)