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Fair Value Disclosures (Schedule Of Assets And Liabilities Measured With Level 3 Inputs) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs |  |  |  |  |
Level 3 inputs, Beginning balance |  | $ 14,651 | $ 4,855 | $ 6,577 | $ 6,761
Transfers into Level 3 |  |  |  |  |
Transfers out of Level 3 |  | (11,295) |  | (13,361) |
Accretion of income | [1] | 489 | 169 | 1,330 | 938
Purchases |  |  |  | 9,600 |
Sales and returns of capital |  | (1,103) | (306) | (1,481) | (2,996)
Level 3 inputs, Ending balance |  | 3,161 | 4,615 | 3,161 | 4,615
Change in unrealized gains /(losses) | [2] | (171) | 187 | (220) | 608
Net Trading [Member] |  |  |  |  |
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs |  |  |  |  |
Transactions included in income - Gains and Losses |  |  |  |  |
Gains and Losses [Member] |  |  |  |  |
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs |  |  |  |  |
Transactions included in income - Gains and Losses | [1] | 419 | $ (103) | 496 | $ (88)
Alternative Investments [Member] |  |  |  |  |
Schedule of additional information about assets and liabilities measured at fair value on a recurring basis level 3 inputs |  |  |  |  |
Level 3 inputs, Beginning balance |  |  |  | 4,511 |
Level 3 inputs, Ending balance |  | $ 16,064 |  | $ 16,064 |
[1] | Gains and losses and accretion of income on investments-trading are recorded as a component of net trading in the consolidated statements of operations. Gains and losses and accretion of income on other investments, at fair value are recorded as a component of principal transactions and other income in the consolidated statements of operations.
[2] | Represents the change in unrealized gains and losses for the period included in current year earnings for assets held at the end of the reporting period.

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Accretion + References No definition available. + Details
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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