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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
	Mar. 31, 2018	Mar. 31, 2017
Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract]
Document Fiscal Year Focus	2018
Interest income	$ 1,509	$ 602
Interest expense	(5,493)	(5,319)
Gains (losses), net on changes in fair value of investments	(5,033)	303
Foreign currency gains (losses), net	1,398	51
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net	(855)	0
Other	(41)	(239)
Other income (expense), net	$ (8,515)	$ (4,602)

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Supplemental Consolidated Balance Sheet & Statement of Operations Information [Abstract]

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Amount of the cost of borrowed funds accounted for as interest expense.

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