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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract] |  |  |  |
Interest income | $ 1,327 | $ 1,430 | $ 2,482 | $ 3,986
Interest expense | (5,473) | (8,009) | (10,589) | (14,967)
Impairment and other changes in fair value of investments | 4,245 | 0 | 4,245 | (8,089)
Loss on extinguishment of debt | (5,090) | 0 | (5,090) | 0
Foreign currency gains (losses), net and other | 2,064 | 4,884 | 24,148 | (1,612)
Other income (expense), net | $ (2,927) | $ (1,695) | 15,196 | (20,682)
Foreign currency translation adjustments reclassified into earnings |  |  | $ 32,284 | $ 0

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