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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues | [1] | $ 742,732 | $ 725,647 | $ 1,493,090 | $ 1,401,178
United States [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | 703,225 | 689,756 | 1,409,293 | 1,337,494
United Kingdom [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | 35,301 | 32,771 | 76,859 | 57,290
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | $ 4,206 | $ 3,120 | $ 6,938 | $ 6,394
[1] | No individual client accounted for more than 10 percent of total net revenues for the three and six months ended June 30, 2018 or 2017.

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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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