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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of financial assets and liabilities measured on recurring basis (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets: |  |
Funds held in trust account | $ 0 | $ 174,437
Securities and other investments owned: |  |
Investments | 992,455 | 965,096
Loans receivable, at fair value | 532,419 | 701,652
Total assets measured at fair value | 1,524,874 | 1,841,185
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 8,601 | 5,897
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | 5,835 | 4,648
Warrant liabilities |  | 173
Contingent consideration | 27,985 | 31,046
Total liabilities measured at fair value | 42,421 | 41,764
Quoted prices in active markets for identical assets (Level 1) |  |
Assets: |  |
Funds held in trust account |  | 174,437
Securities and other investments owned: |  |
Investments | 250,586 | 584,136
Loans receivable, at fair value | 0 | 0
Total assets measured at fair value | 250,586 | 758,573
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,037 | 4,466
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | 0 | 0
Warrant liabilities |  | 173
Contingent consideration | 0 | 0
Total liabilities measured at fair value | 1,037 | 4,639
Other observable inputs (Level 2) |  |
Assets: |  |
Funds held in trust account |  | 0
Securities and other investments owned: |  |
Investments | 6,231 | 12,495
Loans receivable, at fair value | 0 | 0
Total assets measured at fair value | 6,231 | 12,495
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 7,564 | 1,431
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | 0 | 0
Warrant liabilities |  | 0
Contingent consideration | 0 | 0
Total liabilities measured at fair value | 7,564 | 1,431
Significant unobservable inputs (Level 3) |  |
Assets: |  |
Funds held in trust account |  | 0
Securities and other investments owned: |  |
Investments | 735,638 | 368,465
Loans receivable, at fair value | 532,419 | 701,652
Total assets measured at fair value | 1,268,057 | 1,070,117
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | 5,835 | 4,648
Warrant liabilities |  | 0
Contingent consideration | 27,985 | 31,046
Total liabilities measured at fair value | 33,820 | 35,694
Equity securities |  |
Securities and other investments owned: |  |
Investments | 930,179 | 952,601
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,037 | 4,466
Equity securities | Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Investments | 194,541 | 584,136
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,037 | 4,466
Equity securities | Other observable inputs (Level 2) |  |
Securities and other investments owned: |  |
Investments | 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: |  |
Investments | 735,638 | 368,465
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Corporate bonds |  |
Securities and other investments owned: |  |
Investments | 59,287 | 8,539
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 5,971 | 1,162
Corporate bonds | Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Investments | 56,045 | 0
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Corporate bonds | Other observable inputs (Level 2) |  |
Securities and other investments owned: |  |
Investments | 3,242 | 8,539
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 5,971 | 1,162
Corporate bonds | Significant unobservable inputs (Level 3) |  |
Securities and other investments owned: |  |
Investments | 0 | 0
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 0 | 0
Other fixed income securities |  |
Securities and other investments owned: |  |
Investments | 2,989 | 3,956
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,593 | 269
Other fixed income securities | Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Investments | 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: |  |
Investments | 2,989 | 3,956
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,593 | 269
Other fixed income securities | Significant unobservable inputs (Level 3) |  |
Securities and other investments owned: |  |
Investments | 0 | 0
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | $ 0 | $ 0

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