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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]    
Total net revenues [1] $ 1,106,793 $ 1,116,527
United States [Member]    
Segment Reporting Information [Line Items]    
Total net revenues 1,038,895 1,055,102
United Kingdom [Member]    
Segment Reporting Information [Line Items]    
Total net revenues 33,197 43,864
Canada [Member]    
Segment Reporting Information [Line Items]    
Total net revenues 21,978 7,451
Other [Member]    
Segment Reporting Information [Line Items]    
Total net revenues $ 12,723 $ 10,110
[1] No individual client accounted for more than 10 percent of total net revenues for the three months ended March 31, 2023 and 2022.