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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 | Jun. 30, 2026 | Dec. 31, 2025
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Securities and other investments owned at fair value: |  |  |  |
Securities and other investments owned | [1] | $ 660,185 |  | $ 382,461
Equity securities valued under the measurement alternative |  | 63,530 |  | 64,382
Total securities and other investments owned | [1] | 723,715 |  | 446,843
Securities sold not yet purchased, at fair value: |  |  |  |
Securities sold not yet purchased, at fair value |  | 9,487 |  | 9,809
Corporate bonds |  |  |  |
Securities sold not yet purchased, at fair value: |  |  |  |
Securities sold not yet purchased, at fair value |  | 593 |  | 467
Partnership interests and other investments at net asset value |  |  |  |
Securities and other investments owned at fair value: |  |  |  |
Securities and other investments owned |  | 2,374 |  | 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 |  | 657,811 | [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 |  | 83,026 |  | 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 |  | 28,166 |  | 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 |  | 5,175 |  | 4,373
Equity securities |  |  |  |
Securities sold not yet purchased, at fair value: |  |  |  |
Securities sold not yet purchased, at fair value |  | 8,894 |  | 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 |  | $ 541,444 |  | $ 304,422
[1] | (1) At June 30, 2026 and December 31, 2025 the balance sheet includes cash of $183 and $446, securities and other investments owned, at fair value of $713 and $682, prepaid and other expenses of $3,678 and $3,737, accrued expenses and other liabilities of $28 and $28, and noncontrolling interest of $3,939 and $4,192, respectively, of consolidated variable interest entities (see Note 3 - Variable Interest Entities).

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