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SUPPLEMENTAL CONDENSED CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION - Schedule of Other Income (Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Schedule of Equity Method Investments [Line Items]        
Interest income $ 1,336 $ 1,268 $ 3,818 $ 5,254
Interest expense (3,534) (9,408) (14,123) (24,375)
Changes in fair value of investments 91,288 0 95,533 (8,089)
Loss on extinguishment of debt 0 0 (5,090) 0
Foreign currency gains (losses), net and other (6,557) 7,273 17,591 5,661
Other income (expense), net 82,533 $ (867) 97,729 (21,549)
Unrealized gain on investments 89,100   89,100  
Foreign currency translation adjustments reclassified into earnings     32,268 $ 0
Other equity investments        
Schedule of Equity Method Investments [Line Items]        
Unrealized gain on investments $ 89,100   $ 89,100