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Financial Instruments Owned And Financial Instruments Sold, But Not Yet Purchased (Components Of Trading Securities Owned And Trading Securities Sold, But Not Yet Purchased) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | $ 1,143,684 | $ 925,045
U.S. Government Agency Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 147,223 | 89,833
Corporate Fixed Income Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 329,179 | 269,561
Corporate Equity Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 46,802 | 32,044
State and Municipal Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 169,699 | 159,095
U.S. Government Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 13,466 | 9,951
Mortgage Backed Securities [Member] | Non-Agency [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 75,154 | 28,402
Mortgage Backed Securities [Member] | Agency [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 329,691 | 305,774
Sovereign Debt [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 32,470 | 30,385
Securities Sold, But Not yet Purchased [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 778,863 | 699,032
Securities Sold, But Not yet Purchased [Member] | U.S. Government Agency Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned | 10,348 | 20,549
Securities Sold, But Not yet Purchased [Member] | Corporate Fixed Income Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Fixed income securities | 180,755 | 175,301
Securities Sold, But Not yet Purchased [Member] | Corporate Equity Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities | 38,510 | 18,395
Securities Sold, But Not yet Purchased [Member] | State and Municipal Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
State and municipal securities |  | 31
Securities Sold, But Not yet Purchased [Member] | U.S. Government Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned | 442,402 | 362,536
Securities Sold, But Not yet Purchased [Member] | Mortgage Backed Securities [Member] | Non-Agency [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned |  | 1
Securities Sold, But Not yet Purchased [Member] | Mortgage Backed Securities [Member] | Agency [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned | 86,612 | 94,552
Securities Sold, But Not yet Purchased [Member] | Sovereign Debt [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Sovereign debt | 20,236 | 27,667
Securities Owned |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Financial instruments owned, at fair value | 1,143,684 | 925,045
Securities Owned | U.S. Government Agency Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned | 147,223 | 89,833
Securities Owned | Corporate Fixed Income Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Fixed income securities | 329,179 | 269,561
Securities Owned | Corporate Equity Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities | 46,802 | 32,044
Securities Owned | State and Municipal Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
State and municipal securities | 169,699 | 159,095
Securities Owned | U.S. Government Securities [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned | 13,466 | 9,951
Securities Owned | Mortgage Backed Securities [Member] | Non-Agency [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned | 75,154 | 28,402
Securities Owned | Mortgage Backed Securities [Member] | Agency [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Trading securities owned | 329,691 | 305,774
Securities Owned | Sovereign Debt [Member] |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Sovereign debt | $ 32,470 | $ 30,385

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- Definition The fair value as of the balance sheet date of firm holdings in fixed income obligations issued by foreign governments. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: 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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