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Compensation and Benefits - Components of expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Salaries, incentive compensation and benefits $ 118,271 $ 109,563 $ 350,147 $ 352,221
Restricted share-based award compensation expense 7,752 10,017 24,477 30,073
Long-term incentive compensation expense 12,377 12,470 42,446 37,138
Compensation and benefits 130,648 122,033 392,593 389,359
Deferred Bonus        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long-term cash incentive compensation expense $ 4,625 $ 2,453 $ 17,969 $ 7,065