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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of financial assets and liabilities measured on recurring basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Securities and other investments owned:    
Total securities and other investments owned $ 259,796 $ 709,398
Loans receivable, at fair value 151,704 532,419
Total assets measured at fair value 411,500 1,241,817
Securities sold not yet purchased:    
Total securities sold not yet purchased 2,450 8,601
Contingent consideration 23,702 27,986
Contingent consideration   27,985
Total liabilities measured at fair value 26,152 36,586
Quoted prices in active markets for identical assets (Level 1)    
Securities and other investments owned:    
Total securities and other investments owned 189,005 250,586
Loans receivable, at fair value 0 0
Total assets measured at fair value 189,005 250,586
Securities sold not yet purchased:    
Total securities sold not yet purchased 634 1,037
Contingent consideration 0  
Contingent consideration   0
Total liabilities measured at fair value 634 1,037
Other observable inputs (Level 2)    
Securities and other investments owned:    
Total securities and other investments owned 8,843 6,231
Loans receivable, at fair value 0 0
Total assets measured at fair value 8,843 6,231
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,816 7,564
Contingent consideration 0  
Contingent consideration   0
Total liabilities measured at fair value 1,816 7,564
Significant unobservable inputs (Level 3)    
Securities and other investments owned:    
Total securities and other investments owned 61,948 452,581
Loans receivable, at fair value 151,704 532,419
Total assets measured at fair value 213,652 985,000
Securities sold not yet purchased:    
Total securities sold not yet purchased 0 0
Contingent consideration 23,702  
Contingent consideration   27,985
Total liabilities measured at fair value 23,702 27,985
Equity securities    
Securities and other investments owned:    
Total securities and other investments owned 223,543 647,122
Securities sold not yet purchased:    
Total securities sold not yet purchased 634 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 161,595 194,541
Securities sold not yet purchased:    
Total securities sold not yet purchased 634 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 61,948 452,581
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 31,496 59,287
Securities sold not yet purchased:    
Total securities sold not yet purchased 509 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 27,410 56,045
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 4,086 3,242
Securities sold not yet purchased:    
Total securities sold not yet purchased 509 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 4,757 2,989
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,307 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 4,757 2,989
Securities sold not yet purchased:    
Total securities sold not yet purchased 1,307 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