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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | [1] | $ 4,348,944 | $ 4,391,439 | $ 4,737,088
United States [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues |  | 4,095,476 | 4,125,563 | 4,332,743
United Kingdom [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues |  | 152,125 | 192,985 | 239,559
Canada [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues |  | 40,034 | 29,268 | 109,285
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues |  | $ 61,309 | $ 43,623 | $ 55,501
[1] | No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2023, 2022, and 2021.

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