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Compensation and Benefits - Components of expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Salaries, incentive compensation and benefits $ 116,326 $ 115,463 $ 231,876 $ 242,658
Restricted share-based award compensation expense 7,747 9,968 16,725 20,056
Long-term incentive compensation expense 14,107 11,931 30,069 24,668
Compensation and benefits 130,433 127,394 261,945 267,326
Deferred Bonus        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long-term cash incentive compensation expense $ 6,360 $ 1,963 $ 13,344 $ 4,612