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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of fair value measurement of level 3 financial assets and liabilities (Details) - Significant unobservable inputs (Level 3) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Equity securities |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance at beginning of period | $ 387,130 | $ 333,916 | $ 368,465 | $ 377,549
Fair Value Adjustments | (11,194) | 5,453 | (2,923) | (18,594)
Relating to Undistributed Earnings | (47) | 0 | (35) | 0
Purchases, Sales and Settlements | 299,763 | 34 | 317,168 | 18,457
Transfer in and/or out of Level 3 | (535) | (47) | (7,558) | (38,056)
Balance at end of period | 675,117 | 339,356 | 675,117 | 339,356
Equity securities | Trading income (loss) and fair value adjustments |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Fair Value Adjustments | (2,347) | 4,606 | 11,573 | (732)
Equity securities | Realized and unrealized gains (losses) on investments |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Fair Value Adjustments | (8,847) | 847 | (14,496) | (17,862)
Loans receivable at fair value |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance at beginning of period | 683,827 | 770,840 | 701,652 | 873,186
Fair Value Adjustments | (859) | (19,158) | 51,807 | (19,205)
Relating to Undistributed Earnings | 1,531 | 4,181 | 481 | 9,554
Purchases, Sales and Settlements | (135,357) | 58,852 | (204,548) | (7,983)
Transfer in and/or out of Level 3 | 0 | 0 | (250) | (40,837)
Balance at end of period | 549,142 | 814,715 | 549,142 | 814,715
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance at beginning of period | 4,352 | 4,160 | 4,648 | 4,506
Fair Value Adjustments | 0 | 0 | 0 | 0
Relating to Undistributed Earnings | 557 | 356 | 1,335 | 824
Purchases, Sales and Settlements | (325) | (194) | (1,399) | (1,008)
Transfer in and/or out of Level 3 | 0 | 0 | 0 | 0
Balance at end of period | 4,584 | 4,322 | 4,584 | 4,322
Contingent consideration |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance at beginning of period | 27,724 | 17,722 | 31,046 | 0
Fair Value Adjustments | 9 | 620 | (4,561) | (3,880)
Relating to Undistributed Earnings | 0 | 0 | 0 | 0
Purchases, Sales and Settlements | 254 | 11,236 | 1,502 | 33,458
Transfer in and/or out of Level 3 | 0 | 0 | 0 | 0
Balance at end of period | $ 27,987 | $ 29,578 | $ 27,987 | $ 29,578

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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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