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FINANCIAL INSTRUMENTS - Realized and Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Adjustments to Carrying Value of Non-Marketable Equity Securities
Upward adjustments (gross unrealized gains)	$ 53	$ 0	$ 53	$ 128,786
Downward adjustments including impairment (gross unrealized losses)	(543)	0	(1,193)	(2,588)
Total	(490)	0	(1,140)	126,198
Adjustments to Carrying Value of Non-Marketable Equity Securities
Realized (losses) gains, net, for equity securities sold	(8)	702	2,136	27,874
Unrealized (losses) gains, net, on equity securities held	(5,066)	(115)	24,181	126,444
Total (losses) gains recognized, net, in other income, net	$ (5,074)	$ 587	$ 26,317	$ 154,318

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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