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Fair Value of Assets and Liabilities - Schedule of Marketable Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value Disclosures [Abstract]        
Realized gains and losses on equity securities sold $ 0 $ 0 $ (41,436) $ 0
Unrealized gains and losses on equity securities held 40 35,137 (40) 85,643
Gains and losses on equity securities, net $ 40 $ 35,137 $ (41,476) $ 85,643