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Compensation and Benefits - Components of expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Salaries, incentive compensation and benefits $ 95,530 $ 87,708
Compensation and benefits 104,717 99,282
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted share-based award compensation expense $ 9,187 $ 11,574