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Fair Value Measurements - Securities Owned and Securities Sold, But Not Yet Purchased at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned, including amounts pledged of $0 ($546,334 in 2015), at fair value | $ 561,683 | $ 610,517
Securities Sold | 84,145 | 126,171
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned | 561,683 | 610,517
Corporate debt and other obligations |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned, including amounts pledged of $0 ($546,334 in 2015), at fair value | 17,983 | 23,977
Securities Sold | 10,286 | 5,283
Municipal obligations |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned, including amounts pledged of $0 ($546,334 in 2015), at fair value | 28,393 | 25,190
Convertible bonds |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned, including amounts pledged of $0 ($546,334 in 2015), at fair value | 17,152 | $ 17,497
Securities Sold | $ 13,647 |

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- Definition Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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