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Compensation and Benefits - Components of expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Salaries, incentive compensation and benefits $ 89,521 $ 91,579 $ 177,229 $ 182,960
Compensation and benefits 101,486 106,744 200,768 211,968
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted share-based award compensation expense $ 11,965 $ 15,165 $ 23,539 $ 29,008