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Compensation and Benefits - Components of expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Salaries, incentive compensation and benefits $ 469,869 $ 458,609 $ 516,931
Restricted share-based award compensation expense 32,167 40,004 39,236
Long-term incentive compensation expense 59,526 51,773 46,123
Total compensation and benefits 529,395 510,382 563,054
Deferred Bonus      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred Compensation Arrangement with Individual, Compensation Expense $ 27,359 $ 11,769 $ 6,887