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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
Jun. 30, 2023
Dec. 31, 2022
Securities and other investments owned:    
Total securities and other investments owned $ 1,072,444 $ 1,129,268
Securities sold not yet purchased:    
Total securities sold not yet purchased 2,686 5,897
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
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
Partnership interests and other    
Securities and other investments owned:    
Total securities and other investments owned 40,557 70,063
Equity securities    
Securities and other investments owned:    
Total securities and other investments owned 963,817 1,046,710
Securities sold not yet purchased:    
Total securities sold not yet purchased $ 951 $ 4,466