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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues | [1] | $ 883,300 | $ 821,572 | $ 2,692,151 | $ 2,392,779
United States [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | 814,301 | 775,356 | 2,485,336 | 2,271,056
United Kingdom [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | 45,705 | 43,632 | 147,097 | 113,783
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | $ 23,294 | $ 2,584 | $ 59,718 | $ 7,940
[1] | No individual client accounted for more than 10 percent of total net revenues for the three and nine months ended September 30, 2020 or 2019.

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