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Segment Operating Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]          
Net Revenues $ 823,555 $ 402,515 $ 2,173,730 $ 1,336,597  
Operating Expenses 569,848 330,826 1,518,795 1,094,455  
Other Expenses 8,554 8,003 8,561 42,424  
Income Before Income from Equity Method Investments and Income Taxes 245,153 63,686 646,374 199,718  
Income from Equity Method Investments 3,681 3,111 10,099 8,552  
Pre-Tax Income (Loss) 248,834 66,797 656,473 208,270  
Identifiable Segment Assets 3,271,888 2,645,458 3,271,888 2,645,458 $ 3,370,888
Investment Banking [Member]          
Segment Reporting Information [Line Items]          
Net Revenues 806,918 385,463 2,125,023 1,294,493  
Operating Expenses 556,277 318,655 1,480,963 1,057,926  
Other Expenses 0 7,703 7 42,092  
Income Before Income from Equity Method Investments and Income Taxes 250,641 59,105 644,053 194,475  
Income from Equity Method Investments 564 570 1,282 1,171  
Pre-Tax Income (Loss) 251,205 59,675 645,335 195,646  
Identifiable Segment Assets 3,097,453 2,460,068 3,097,453 2,460,068  
Investment Management [Member]          
Segment Reporting Information [Line Items]          
Net Revenues 16,637 17,052 48,707 42,104  
Operating Expenses 13,571 12,171 37,832 36,529  
Other Expenses 8,554 300 8,554 332  
Income Before Income from Equity Method Investments and Income Taxes (5,488) 4,581 2,321 5,243  
Income from Equity Method Investments 3,117 2,541 8,817 7,381  
Pre-Tax Income (Loss) (2,371) 7,122 11,138 12,624  
Identifiable Segment Assets $ 174,435 $ 185,390 $ 174,435 $ 185,390