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FAIR VALUE MEASUREMENTS - Change in Investment in Privately Held Companies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Convertible debt fair value	$ 665,900
Privately held investment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	8,345	$ 4,871
New investments	500	1,490
Sales of investments	(400)	(1,424)
Changes in foreign exchange rates	(9)	(73)
Changes in fair value included in other income	100	1,374
Changes in fair value included in other comprehensive income	1,220	100
Ending balance	$ 9,756	$ 6,338

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Changes in Foreign Exchange Rates

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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

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- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Publisher FASB
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-Section 50
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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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