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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of equity securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | $ 99,859 | $ 36,851
Gross Unrealized Gain | 264,879 | 74,099
Gross Unrealized Loss | (2,960) | (1,847)
Fair Value | 361,778 | 109,103
Trading securities - Debt |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 56,037 | 32,765
Gross Unrealized Gain | 262,811 | 72,689
Gross Unrealized Loss | (1,488) | (583)
Fair Value | 317,360 | 104,871
Trading securities - Equity |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Cost | 43,822 | 4,086
Gross Unrealized Gain | 2,068 | 1,410
Gross Unrealized Loss | (1,472) | (1,264)
Fair Value | $ 44,418 | $ 4,232

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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