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Segment Operating Results - Segment Contribution (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]          
Net Revenues $ 734,222 $ 570,220 $ 2,004,261 $ 1,641,782  
Operating Expenses 604,924 493,394 1,682,600 1,397,415  
Other Expenses 7,305 0 7,305 2,921  
Income Before Income from Equity Method Investments and Income Taxes 121,993 76,826 314,356 241,446  
Income from Equity Method Investments 1,072 1,664 5,254 4,674  
Pre-Tax Income 123,065 78,490 319,610 246,120  
Identifiable Segment Assets 3,567,547 3,225,798 3,567,547 3,225,798 $ 3,703,298
Investment Banking and Equities [Member]          
Segment Reporting Information [Line Items]          
Net Revenues 712,775 552,641 1,944,513 1,589,698  
Operating Expenses 589,083 479,429 1,638,289 1,356,853  
Other Expenses 7,305 0 7,305 2,921  
Income Before Income from Equity Method Investments and Income Taxes 116,387 73,212 298,919 229,924  
Income from Equity Method Investments 207 180 1,042 394  
Pre-Tax Income 116,594 73,392 299,961 230,318  
Identifiable Segment Assets 3,432,220 3,068,495 3,432,220 3,068,495  
Investment Management [Member]          
Segment Reporting Information [Line Items]          
Net Revenues 21,447 17,579 59,748 52,084  
Operating Expenses 15,841 13,965 44,311 40,562  
Income Before Income from Equity Method Investments and Income Taxes 5,606 3,614 15,437 11,522  
Income from Equity Method Investments 865 1,484 4,212 4,280  
Pre-Tax Income 6,471 5,098 19,649 15,802  
Identifiable Segment Assets $ 135,327 $ 157,303 $ 135,327 $ 157,303