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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 | Dec. 31, 2023 | Dec. 31, 2022
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Securities and other investments owned: |  |
Total securities and other investments owned | $ 1,092,106 | $ 1,129,268
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 8,601 | 5,897
Corporate bonds |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 59,287 | 8,539
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 5,971 | 1,162
Other fixed income securities |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 2,989 | 3,956
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | 1,593 | 269
Partnership interests and other |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 35,196 | 70,063
Equity securities |  |
Securities and other investments owned: |  |
Total securities and other investments owned | 994,634 | 1,046,710
Securities sold not yet purchased: |  |
Total securities sold not yet purchased | $ 1,037 | $ 4,466

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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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- 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://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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