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SECURITIES AND OTHER INVESTMENTS OWNED AND SECURITIES SOLD NOT YET PURCHASED - Schedule of securities and other investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Securities and other investments owned at fair value:    
Securities and other investments owned, at fair value [1] $ 576,153 $ 382,461
Equity securities valued under the measurement alternative 63,515 64,382
Total securities and other investments owned [1] 639,668 446,843
Securities sold not yet purchased, at fair value:    
Securities sold not yet purchased, at fair value 16,833 9,809
Corporate bonds    
Securities sold not yet purchased, at fair value:    
Securities sold not yet purchased, at fair value 639 467
Other fixed income securities    
Securities sold not yet purchased, at fair value:    
Securities sold not yet purchased, at fair value 2,040 0
Partnership interests and other investments at net asset value    
Securities and other investments owned at fair value:    
Securities and other investments owned, at fair value 2,676 1,833
Fair Value, Inputs, Level 1, Level 2, and Level 3    
Securities and other investments owned at fair value:    
Securities and other investments owned, at fair value 573,477 [1] 380,628
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Partnership interests and other investments    
Securities and other investments owned at fair value:    
Securities and other investments owned, at fair value 52,650 40,082
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Corporate bonds    
Securities and other investments owned at fair value:    
Securities and other investments owned, at fair value 33,134 31,751
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Other fixed income securities    
Securities and other investments owned at fair value:    
Securities and other investments owned, at fair value 2,081 4,373
Equity securities    
Securities sold not yet purchased, at fair value:    
Securities sold not yet purchased, at fair value 14,154 9,342
Equity securities | Fair Value, Inputs, Level 1, Level 2, and Level 3    
Securities and other investments owned at fair value:    
Securities and other investments owned, at fair value $ 485,612 $ 304,422
[1]
(1) At March 31, 2026 and December 31, 2025 the balance sheet includes cash of $519 and $446, securities and other investments owned, at fair value of $723 and $682, prepaid and other expenses of $3,704 and $3,737, accrued expenses and other liabilities of $28 and $28, and noncontrolling interest of $4,261 and $4,192, respectively, of consolidated variable interest entities (see Note 3 - Variable Interest Entities).