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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Total net revenues [1] $ 1,163,038 $ 1,106,793
United States [Member]    
Segment Reporting Information [Line Items]    
Total net revenues 1,101,004 1,038,895
United Kingdom [Member]    
Segment Reporting Information [Line Items]    
Total net revenues 37,525 33,197
Canada [Member]    
Segment Reporting Information [Line Items]    
Total net revenues 11,620 21,978
Other [Member]    
Segment Reporting Information [Line Items]    
Total net revenues $ 12,889 $ 12,723
[1] No individual client accounted for more than 10 percent of total net revenues for the three months ended March 31, 2024 and 2023.