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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues | [1] | $ 4,737,088 | $ 3,752,061 | $ 3,337,030
United States [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues |  | 4,332,743 | 3,460,930 | 3,154,285
United Kingdom [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues |  | 239,559 | 197,859 | 163,552
Canada [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues |  | 109,285 | 39,893 | 2,115
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total net revenues |  | $ 55,501 | $ 53,379 | $ 17,078
[1] | No individual client accounted for more than 10 percent of total net revenues for the years ended December 31, 2021, 2020, and 2019.

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