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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Total net revenues | [1] | $ 1,106,793 | $ 1,116,527
United States [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues |  | 1,038,895 | 1,055,102
United Kingdom [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues |  | 33,197 | 43,864
Canada [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues |  | 21,978 | 7,451
Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues |  | $ 12,723 | $ 10,110
[1] | No individual client accounted for more than 10 percent of total net revenues for the three months ended March 31, 2023 and 2022.

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