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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 | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Equity securities |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance at beginning of period | $ 359,041 | $ 388,664 | $ 368,465 | $ 377,549
Fair Value Adjustments | 17,287 | (19,504) | 8,271 | (24,047)
Relating to Undistributed Earnings | 12 | 0 | 12 | 0
Purchases, Sales and Settlements | 10,918 | (1,489) | 17,405 | 18,423
Transfer in and/or out of Level 3 | (128) | (33,755) | (7,023) | (38,009)
Balance at end of period | 387,130 | 333,916 | 387,130 | 333,916
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 | 13,932 |  | 13,920 |
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 | 3,355 |  | (5,649) |
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 | 772,085 | 882,391 | 701,652 | 873,186
Fair Value Adjustments | 9,207 | (10,984) | 52,666 | (47)
Relating to Undistributed Earnings | (1,281) | 2,135 | (1,050) | 5,373
Purchases, Sales and Settlements | (95,934) | (61,865) | (69,191) | (66,835)
Transfer in and/or out of Level 3 | (250) | (40,837) | (250) | (40,837)
Balance at end of period | 683,827 | 770,840 | 683,827 | 770,840
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 | 4,654 | 4,502 | 4,648 | 4,506
Fair Value Adjustments | 0 | 0 | 0 | 0
Relating to Undistributed Earnings | 470 | 221 | 778 | 468
Purchases, Sales and Settlements | (772) | (563) | (1,074) | (814)
Transfer in and/or out of Level 3 | 0 | 0 | 0 | 0
Balance at end of period | 4,352 | 4,160 | 4,352 | 4,160
Contingent consideration |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance at beginning of period | 28,884 | 22,464 | 31,046 | 0
Fair Value Adjustments | (1,123) | (4,500) | (4,570) | (4,500)
Relating to Undistributed Earnings | 0 | 0 | 0 | 0
Purchases, Sales and Settlements | (37) | (242) | 1,248 | 22,222
Transfer in and/or out of Level 3 | 0 | 0 | 0 | 0
Balance at end of period | $ 27,724 | $ 17,722 | $ 27,724 | $ 17,722

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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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