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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, 2020 | Dec. 31, 2019
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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 | $ 646,680 | $ 799,719
Securities Sold | 222,449 | 100,571
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned | 646,680 | 799,719
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 | 27,111 | 8,310
Securities Sold | 6,049 | 664
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 | 46,645 | 40,260
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 | 19,992 | $ 29,816
Securities Sold | $ 6,434 |

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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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