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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues | [1] | $ 1,108,126 | $ 1,153,136 | $ 2,224,653 | $ 2,287,925
United States [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | 1,042,369 | 1,058,541 | 2,097,471 | 2,074,436
United Kingdom [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | 49,992 | 58,507 | 93,856 | 119,725
Canada [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | 5,933 | 24,656 | 13,384 | 67,012
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues |  | $ 9,832 | $ 11,432 | $ 19,942 | $ 26,752
[1] | No individual client accounted for more than 10 percent of total net revenues for the three and six months ended June 30, 2022 and 2021.

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