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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of financial assets and liabilities measured on recurring basis (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets: |  |
Funds held in trust account for BRPM 250 to redeem noncontrolling interests in equity of subsidiaries | $ 0 | $ 174,437
Securities and other investments owned: |  |
Total securities and other investments owned | 942,928 | 965,096
Loans receivable, at fair value | 683,827 | 701,652
Total assets measured at fair value | 1,626,755 | 1,841,185
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 2,686 | 5,897
Mandatorily redeemable noncontrolling interests issued after November 5, 2003 | 4,352 | 4,648
Warrant liabilities |  | 173
Contingent consideration | 27,724 | 31,046
Total liabilities measured at fair value | 34,762 | 41,764
Quoted prices in active markets for identical assets (Level 1) |  |
Assets: |  |
Funds held in trust account for BRPM 250 to redeem noncontrolling interests in equity of subsidiaries |  | 174,437
Securities and other investments owned: |  |
Total securities and other investments owned | 544,809 | 584,136
Loans receivable, at fair value | 0 | 0
Total assets measured at fair value | 544,809 | 758,573
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 951 | 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 | 951 | 4,639
Other observable inputs (Level 2) |  |
Assets: |  |
Funds held in trust account for BRPM 250 to redeem noncontrolling interests in equity of subsidiaries |  | 0
Securities and other investments owned: |  |
Total securities and other investments owned | 10,989 | 12,495
Loans receivable, at fair value | 0 | 0
Total assets measured at fair value | 10,989 | 12,495
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,735 | 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 | 1,735 | 1,431
Significant unobservable inputs (Level 3) |  |
Assets: |  |
Funds held in trust account for BRPM 250 to redeem noncontrolling interests in equity of subsidiaries |  | 0
Securities and other investments owned: |  |
Total securities and other investments owned | 387,130 | 368,465
Loans receivable, at fair value | 683,827 | 701,652
Total assets measured at fair value | 1,070,957 | 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 | 4,352 | 4,648
Warrant liabilities |  | 0
Contingent consideration | 27,724 | 31,046
Total liabilities measured at fair value | 32,076 | 35,694
Equity securities |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 874,858 | 952,601
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 951 | 4,466
Equity securities | Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 487,728 | 584,136
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 951 | 4,466
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 | 387,130 | 368,465
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 | 62,977 | 8,539
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 703 | 1,162
Corporate bonds | Quoted prices in active markets for identical assets (Level 1) |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 57,081 | 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: |  |
Total securities and other investments owned | 5,896 | 8,539
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 703 | 1,162
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 | 5,093 | 3,956
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,032 | 269
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 | 5,093 | 3,956
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,032 | 269
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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