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SUPPLEMENTAL 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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract]        
Document Fiscal Year Focus     2018  
Interest income $ 1,513 $ 894 $ 4,858 $ 2,155
Interest expense (5,713) (5,156) (16,434) (15,423)
Gains (losses), net on changes in fair value of investments (244) (3,955) (8,312) (5,100)
Gain on sale of investment 0 7,624 0 7,624
Foreign currency gains (losses), net (1,033) 8,186 (12,168) 19,063
Impairments of investments (112) 0 (10,156) 0
Other 729 (47) 2,380 503
Other income (expense), net $ (4,860) $ 7,546 $ (39,832) $ 8,822