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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues | [1] | $ 1,153,136 | $ 895,817 | $ 2,287,925 | $ 1,808,851
United States [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | 1,058,541 | 810,903 | 2,074,436 | 1,671,035
United Kingdom [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | 58,507 | 63,654 | 119,725 | 101,392
Canada [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | 24,656 | 10,082 | 67,012 | 13,625
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | $ 11,432 | $ 11,178 | $ 26,752 | $ 22,799
[1] | No individual client accounted for more than 10 percent of total net revenues for the three and six months ended June 30, 2021 or 2020.

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