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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues | [1] | $ 895,817 | $ 800,787 | $ 1,808,851 | $ 1,571,207
United States [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | 810,903 | 754,470 | 1,671,035 | 1,495,700
United Kingdom [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | 63,654 | 43,761 | 101,392 | 70,151
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | $ 21,260 | $ 2,556 | $ 36,424 | $ 5,356
[1] | No individual client accounted for more than 10 percent of total net revenues for the three and six months ended June 30, 2020 or 2019.

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