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SUPPLEMENTAL CONSOLIDATED BALANCE SHEETS AND STATEMENTS OF OPERATIONS INFORMATION - Schedule of Other Income (Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract] |  |  |
Interest income | $ 6,351 | $ 7,744 | $ 6,420
Interest expense | (33,192) | (23,593) | (21,909)
Changes in fair value of investments | (1,405) | (72,497) | (9,064)
Foreign currency gains (losses), net | 17,919 | (5,960) | (20,325)
Impairments of investments | (6,684) | (9,961) | (10,156)
Upward adjustment for observable price change of investment | 0 | 51,397 | 0
Other | 43 | (459) | 2,026
Other income (expense), net | $ (16,968) | $ (53,329) | $ (53,008)

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