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Compensation and Benefits - Components of expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Salaries, incentive compensation and benefits $ 109,563 $ 130,831 $ 352,221 $ 385,106
Restricted share-based award compensation expense 10,017 9,598 30,073 29,666
Long-term incentive compensation expense 12,470 11,404 37,138 34,607
Compensation and benefits 122,033 142,235 389,359 419,713
Deferred Bonus        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long-term cash incentive compensation expense $ 2,453 $ 1,806 $ 7,065 $ 4,941