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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 |

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