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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
	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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Observable Price Change Adjustments, Investments, Upward Adjustment

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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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