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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues | [1] | $ 1,429,396 | $ 1,224,668 | $ 3,969,151 | $ 3,605,638
United States [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | 1,349,681 | 1,167,463 | 3,753,964 | 3,415,635
United Kingdom [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | 48,260 | 32,945 | 138,838 | 113,168
Canada [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | 15,079 | 9,309 | 40,649 | 31,539
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | $ 16,376 | $ 14,951 | $ 35,700 | $ 45,296
[1] | No individual client accounted for more than 10 percent of total net revenues for the three and nine months ended September 30, 2025 and 2024.

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