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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of financial assets and liabilities measured on recurring basis (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Securities and other investments owned: |  |
Total securities and other investments owned | $ 862,769 | $ 992,455
Loans receivable, at fair value | 452,496 | 532,419
Total assets measured at fair value | 1,315,265 | 1,524,874
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 6,423 | 8,601
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | 5,601 | 5,835
Contingent consideration | 29,322 | 27,986
Contingent consideration |  | 27,985
Total liabilities measured at fair value | 41,346 | 42,421
Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 177,889 | 250,586
Loans receivable, at fair value | 0 | 0
Total assets measured at fair value | 177,889 | 250,586
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 2,645 | 1,037
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | 0 | 0
Contingent consideration | 0 |
Contingent consideration |  | 0
Total liabilities measured at fair value | 2,645 | 1,037
Other observable inputs (Level 2) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 10,201 | 6,231
Loans receivable, at fair value | 0 | 0
Total assets measured at fair value | 10,201 | 6,231
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 3,778 | 7,564
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | 0 | 0
Contingent consideration | 0 |
Contingent consideration |  | 0
Total liabilities measured at fair value | 3,778 | 7,564
Significant unobservable inputs (Level 3) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 674,679 | 735,638
Loans receivable, at fair value | 452,496 | 532,419
Total assets measured at fair value | 1,127,175 | 1,268,057
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | 5,601 | 5,835
Contingent consideration | 29,322 |
Contingent consideration |  | 27,985
Total liabilities measured at fair value | 34,923 | 33,820
Equity securities |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 801,002 | 930,179
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 2,609 | 1,037
Equity securities | Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 126,323 | 194,541
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 2,609 | 1,037
Equity securities | Other observable inputs (Level 2) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 0 | 0
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Equity securities | Significant unobservable inputs (Level 3) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 674,679 | 735,638
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Corporate bonds |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 56,616 | 59,287
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 2,592 | 5,971
Corporate bonds | Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 51,566 | 56,045
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 36 | 0
Corporate bonds | Other observable inputs (Level 2) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 5,050 | 3,242
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 2,556 | 5,971
Corporate bonds | Significant unobservable inputs (Level 3) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 0 | 0
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Other fixed income securities |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 5,151 | 2,989
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,222 | 1,593
Other fixed income securities | Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 0 | 0
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Other fixed income securities | Other observable inputs (Level 2) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 5,151 | 2,989
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,222 | 1,593
Other fixed income securities | Significant unobservable inputs (Level 3) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 0 | 0
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | $ 0 | $ 0

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