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Financial Instruments (Schedule Of Trading Securities Sold, Not Yet Purchased) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |  |  |
Trading securities sold, not yet purchased | $ 49,504 |  | $ 44,167 |
U.S. government agency MBS [Member] |  |  |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |  |  |
Trading securities sold, not yet purchased | 121 | [1] | 13 | [1]
U.S. Treasury securities [Member] |  |  |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |  |  |
Trading securities sold, not yet purchased | 38,066 |  | 19,722 |
Corporate bonds and redeemable preferred stock [Member] |  |  |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |  |  |
Trading securities sold, not yet purchased | 10,679 |  | 21,976 |
Foreign government bonds [Member] |  |  |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |  |  |
Trading securities sold, not yet purchased | 26 |  |  |
Municipal bonds [Member] |  |  |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |  |  |
Trading securities sold, not yet purchased | 88 |  | 128 |
Certificates of deposit [Member] |  |  |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |  |  |
Trading securities sold, not yet purchased | 524 |  | 2,325 |
Equity securities [Member] |  |  |  |
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items] |  |  |  |
Trading securities sold, not yet purchased |  |  | $ 3 |
[1] | Includes TBAs. See notes 3-G and 10.

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- Definition Fair value of obligations incurred from short sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29643654&loc=d3e42429-110968 + Details
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