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Special Charges, Including Business Realignment Costs, and Intangible Asset Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Business Acquisition [Line Items]      
Special Charges, Including Business Realignment Costs $ 0 $ 23,676  
Headcount Reductions (as a percent)     8.00%
Investment Banking [Member]      
Business Acquisition [Line Items]      
Special Charges, Including Business Realignment Costs 0 23,644  
Amortization of Intangible Assets   507  
Investment Management [Member]      
Business Acquisition [Line Items]      
Special Charges, Including Business Realignment Costs 0 32  
Amortization of Intangible Assets $ 91 108  
Special Charges [Member]      
Business Acquisition [Line Items]      
Restructuring Charges   22,127  
Accelerated Depreciation For Leasehold Improvements   $ 1,549