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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
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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

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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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