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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 | Sep. 30, 2024 | Dec. 31, 2023
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Securities and other investments owned: |  |
Total securities and other investments owned | $ 341,770 | $ 809,049
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 2,450 | 8,601
Corporate bonds |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 31,496 | 59,287
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 509 | 5,971
Other fixed income securities |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 4,757 | 2,989
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,307 | 1,593
Partnership interests and other |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 16,238 | 35,196
Equity securities |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 289,279 | 711,577
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | $ 634 | $ 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://www.xbrl.org/2009/role/commonPracticeRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479035/940-320-45-2 + Details
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- Definition Fair value of financial instruments sold short 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://www.xbrl.org/2009/role/commonPracticeRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479035/940-320-45-2 + Details
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