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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net revenues | $ 661,391 | $ 641,986 | $ 652,145 | $ 619,974 | $ 581,286 | $ 591,575 | $ 597,751 | $ 560,982 | $ 2,575,496 | [1] | $ 2,331,594 | [1] | $ 2,208,424 | [1]
United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 2,433,674 |  | 2,195,538 |  | 2,082,876 |
United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | 132,622 |  | 125,552 |  | 113,943 |
Other European [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net revenues |  |  |  |  |  |  |  |  | $ 9,200 |  | $ 10,504 |  | $ 11,605 |
[1] | No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2016, 2015, and 2014.

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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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