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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
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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

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- Definition Fair value of financial instruments held by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481961/940-320-45-2 + Details
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