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Segment Operating Results - (Footnotes) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Other Revenue, net $ (2,882) $ 7,326 $ 11,873 $ (3,875)
Special Charges, Including Business Realignment Costs 8,554 7,380 8,554 39,614
Acquisition and Transition Costs 0 454 7 560
Total Other Expenses 8,554 8,003 8,561 42,424
Investment Banking [Member]        
Segment Reporting Information [Line Items]        
Other Revenue, net (2,559) 4,299 11,258 (6,254)
Interest expense on Notes Payable 4,393 4,218 13,269 13,594
Amortization of LP Units 0 0 0 1,067
Special Charges, Including Business Realignment Costs 0 7,380 0 39,582
Acquisition and Transition Costs 0 154 7 260
Intangible Asset Amortization 0 169 0 1,183
Total Other Expenses 0 7,703 7 42,092
Investment Management [Member]        
Segment Reporting Information [Line Items]        
Other Revenue, net (323) 3,027 615 2,379
Special Charges, Including Business Realignment Costs 8,554 0 8,554 32
Acquisition and Transition Costs 0 300 0 300
Total Other Expenses $ 8,554 $ 300 $ 8,554 $ 332