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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | [1] | $ 4,970,320 | $ 4,348,944 | $ 4,391,439
United States [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues |  | 4,705,379 | 4,095,476 | 4,125,563
United Kingdom [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues |  | 158,810 | 152,125 | 192,985
Canada [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues |  | 40,536 | 40,034 | 29,268
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues |  | $ 65,595 | $ 61,309 | $ 43,623
[1] | No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2024, 2023, and 2022.

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