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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting Information [Line Items]        
Total net revenues [1] $ 1,045,139 $ 1,144,938 $ 3,269,792 $ 3,432,863
United States [Member]        
Segment Reporting Information [Line Items]        
Total net revenues 987,770 1,067,901 3,085,241 3,142,337
United Kingdom [Member]        
Segment Reporting Information [Line Items]        
Total net revenues 40,980 57,413 134,836 177,138
Canada [Member]        
Segment Reporting Information [Line Items]        
Total net revenues 7,798 9,523 21,182 76,535
Other [Member]        
Segment Reporting Information [Line Items]        
Total net revenues $ 8,591 $ 10,101 $ 28,533 $ 36,853
[1] No individual client accounted for more than 10 percent of total net revenues for the three and nine months ended September 30, 2022 and 2021.