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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |  |
Total net revenues | [1] | $ 1,163,038 | $ 1,106,793
United States [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues |  | 1,101,004 | 1,038,895
United Kingdom [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues |  | 37,525 | 33,197
Canada [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues |  | 11,620 | 21,978
Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues |  | $ 12,889 | $ 12,723
[1] | No individual client accounted for more than 10 percent of total net revenues for the three months ended March 31, 2024 and 2023.

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