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Segment Operating Results - (Footnotes) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Segment Reporting Information [Line Items]    
Other Revenue, net $ (20,803) $ 8,243
Special Charges, Including Business Realignment Costs 23,676 1,029
Acquisition and Transition Costs 8 108
Total Other Expenses 25,258 7,366
Investment Banking [Member]    
Segment Reporting Information [Line Items]    
Other Revenue, net (21,407) 6,487
Interest expense on Notes Payable and Line of Credit 4,842 2,264
Amortization of LP Units and Certain Other Awards 1,067 4,072
Special Charges, Including Business Realignment Costs 23,644 1,029
Acquisition and Transition Costs 8 0
Intangible Asset and Other Amortization 507 2,157
Total Other Expenses 25,226 7,258
Investment Management [Member]    
Segment Reporting Information [Line Items]    
Other Revenue, net 604 1,756
Special Charges, Including Business Realignment Costs 32 0
Acquisition and Transition Costs 0 108
Total Other Expenses $ 32 $ 108