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FAIR VALUE MEASUREMENTS - Reconciliations of Assets and Liabilities Categorized within Level 3 (Details) - Recurring [Member] - Level 3 [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Available-for-Sale Investments [Member]
Reconciliations of Assets and Liabilities [Abstract]
Beginning balance	$ 21,357	$ 37,589	$ 128,418
Additions	146,871	20,429
Impairments		(37,571)	(13,429)
Conversion into ordinary shares of investees			(72,000)
Fair value loss included in other comprehensive income	(3,769)	910	(5,400)
Ending balance	164,459	21,357	37,589
Investments Carried at Fair Value [Member]
Reconciliations of Assets and Liabilities [Abstract]
Beginning balance	0
Additions	21,992
Ending balance	21,992	0
Other Assets [Member]
Reconciliations of Assets and Liabilities [Abstract]
Beginning balance	19,024	19,228	0
Acquisition of subsidiary		142	8,718
Additions	186	2,412	10,928
Disposals	(1,989)	(318)	(45)
Write-down	(441)	(3,713)
Exchange differences	(559)	1,273	(373)
Ending balance	$ 16,221	$ 19,024	$ 19,228

X

- Definition

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

+ References

No definition available.

+ Details

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- Definition

Addition of asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

No definition available.

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- Definition

Amount of conversion into ordinary shares of investee 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.

+ References

No definition available.

+ Details

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- Definition

Disposal of an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

No definition available.

+ Details

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- Definition

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Exchange Effect

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Write-down of other current assets, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

No definition available.

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- References

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- Definition

Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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- Definition

Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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