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Compensation and Benefits - Components of expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Salaries, incentive compensation and benefits $ 89,969 $ 90,097 $ 267,198 $ 273,057
Compensation and benefits 99,847 102,741 300,615 314,709
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted share-based award compensation expense $ 9,878 $ 12,644 $ 33,417 $ 41,652