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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
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
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 | $ 5,601 | $ 4,654 | $ 5,835 | $ 4,648
Fair value adjustments | 0 | 0 | 0 | 0
Relating to Undistributed Earnings | 492 | 470 | 785 | 778
Purchases/ Originations | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements/ Repayments | (789) | (772) | (1,316) | (1,074)
Transfer in and/or out of Level 3 | 0 | 0 | 0 | 0
Balance at end of period | 5,304 | 4,352 | 5,304 | 4,352
Change in unrealized gains/(losses) | 0 | 0 | 0 | 0
Contingent consideration |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance at beginning of period | 29,322 | 28,884 | 27,985 | 31,046
Fair value adjustments | 264 | (1,123) | 1,671 | (4,570)
Relating to Undistributed Earnings | 0 | 0 | 0 | 0
Purchases/ Originations | 1,055 | 0 | 1,055 | 2,586
Sales | 0 | 0 | 0 | 0
Settlements/ Repayments | (1,338) | (37) | (1,408) | (1,338)
Transfer in and/or out of Level 3 | 0 | 0 | 0 | 0
Balance at end of period | 29,303 | 27,724 | 29,303 | 27,724
Change in unrealized gains/(losses) | 0 | 0 | 0 | 0
Loans receivable at fair value |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of period | 452,496 | 772,085 | 532,419 | 701,652
Fair value adjustments | (175,582) | 9,207 | (187,783) | 52,483
Relating to Undistributed Earnings | 1,102 | (1,281) | 4,262 | (1,050)
Purchases/ Originations | 7,129 | 48,231 | 38,105 | 355,546
Sales | 0 | 0 | (22,785) | (7,499)
Settlements/ Repayments | (55,946) | (144,165) | (135,019) | (417,055)
Transfer in and/or out of Level 3 | 0 | (250) | 0 | (250)
Balance at end of period | 229,199 | 683,827 | 229,199 | 683,827
Change in unrealized gains/(losses) | 177,060 | 9,064 | 196,240 | 52,522
Equity securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of period | 674,679 | 359,041 | 735,638 | 368,465
Fair value adjustments | (203,022) | 17,287 | (254,031) | 8,271
Relating to Undistributed Earnings | 8 | 12 | 20 | 12
Purchases/ Originations | 181 | 44,923 | 616 | 51,447
Sales | (68,874) | (34,005) | (78,197) | (34,042)
Settlements/ Repayments | 0 | 0 | 0 | 0
Transfer in and/or out of Level 3 | (3) | (128) | (1,077) | (7,023)
Balance at end of period | 402,969 | 387,130 | 402,969 | 387,130
Change in unrealized gains/(losses) | 203,129 | (626) | 257,224 | (10,009)
Trading income (loss) and fair value adjustments | Equity securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value adjustments | (39,115) | 13,932 | (49,505) | 13,920
Realized and unrealized gains (losses) on investments | Equity securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value adjustments | $ (163,907) | $ 3,355 | $ (204,526) | $ (5,649)

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