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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Total net revenues | [1] | $ 1,116,527 | $ 1,134,789
United States [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues |  | 1,055,102 | 1,015,895
United Kingdom [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues |  | 43,864 | 61,218
Canada [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues |  | 7,451 | 42,356
Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues |  | $ 10,110 | $ 15,320
[1] | No individual client accounted for more than 10 percent of total net revenues for the three months ended March 31, 2022 and 2021.

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