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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, 2015 | Dec. 31, 2014
--- | --- | ---
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | $ 1,040,631 | $ 843,155
Securities Sold | 311,664 | 92,510
US Treasury and Government [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 750,031 | 570,607
Securities Sold | 259,810 | 30,615
Corporate Debt and Other Obligations [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 15,475 | 19,795
Securities Sold | 7,070 | 2,646
Mortgage and Other Asset-Backed Securities [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 7,276 | 6,689
Securities Sold | 28 | 255
Municipal Obligations [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 74,365 | 60,833
Securities Sold | 50 | 51
Convertible Bonds [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 54,946 | 49,813
Securities Sold | 9,539 | 11,369
Corporate Equities [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 41,209 | 42,751
Securities Sold | 35,167 | 47,574
Money Markets [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 846 | 1,245
Securities Sold | 0 | 0
Auction Rate Securities [Member] |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |
Securities owned | 96,483 | 91,422
Securities Sold | $ 0 | $ 0

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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