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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
Mar. 31, 2024
Dec. 31, 2023
Securities and other investments owned:    
Total securities and other investments owned $ 949,868 $ 1,092,106
Securities sold not yet purchased:    
Total securities sold not yet purchased 6,423 8,601
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
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
Partnership interests and other    
Securities and other investments owned:    
Total securities and other investments owned 18,964 35,196
Equity securities    
Securities and other investments owned:    
Total securities and other investments owned 869,137 994,634
Securities sold not yet purchased:    
Total securities sold not yet purchased $ 2,609 $ 1,037