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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract]        
Interest income $ 1,268 $ 1,959 $ 5,254 $ 5,810
Interest expense (9,408) (6,029) (24,375) (17,162)
Changes in fair value of investments 0 14 (1,405) (68,971)
Foreign currency gains (losses), net 7,273 (13,197) 5,661 (12,279)
Impairment of investment 0 0 (6,684) 0
Other income (expense), net $ (867) $ (17,253) $ (21,549) $ (92,602)