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Compensation and Benefits - Components of expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Salaries, incentive compensation and benefits $ 115,463 $ 125,911 $ 242,658 $ 254,275
Restricted share-based award compensation expense 9,968 10,181 20,056 20,068
Long-term incentive compensation expense 11,931 12,102 24,668 23,203
Compensation and benefits 127,394 138,013 267,326 277,478
Deferred Bonus        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Long-term cash incentive compensation expense $ 1,963 $ 1,921 $ 4,612 $ 3,135