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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of securities and other investments owned and securities sold not yet purchased at fair value (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Securities and other investments owned:    
Total securities and other investments owned $ 341,770 $ 809,049
Securities sold not yet purchased:    
Total securities sold not yet purchased 2,450 8,601
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
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
Partnership interests and other    
Securities and other investments owned:    
Total securities and other investments owned 16,238 35,196
Equity securities    
Securities and other investments owned:    
Total securities and other investments owned 289,279 711,577
Securities sold not yet purchased:    
Total securities sold not yet purchased $ 634 $ 1,037