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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Total net revenues | [1] | $ 675,531 | $ 619,974
United States [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues |  | 648,331 | 581,737
United Kingdom [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues |  | 24,519 | 35,748
Other European [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues |  | $ 2,681 | $ 2,489
[1] | No individual client accounted for more than 10 percent of total net revenues for the three months ended March 31, 2017 or 2016.

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income after deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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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- Details
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- Details
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