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Segment Operating Results (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]          
Net Revenues $ 381,259 $ 406,601 $ 1,293,299 $ 1,164,318  
Operating Expenses 298,831 307,291 979,602 885,014  
Other Expenses 7,888 12,240 21,826 34,639  
Income Before Income from Equity Method Investments and Income Taxes 74,540 87,070 291,871 244,665  
Income (Loss) from Equity Method Investments 2,298 1,827 6,842 5,507  
Pre-Tax Income 76,838 88,897 298,713 250,172  
Identifiable Segment Assets 1,705,607 1,561,035 1,705,607 1,561,035 $ 1,584,886
Investment Banking [Member]          
Segment Reporting Information [Line Items]          
Net Revenues 366,834 388,299 1,252,709 1,115,478  
Operating Expenses 287,809 293,264 946,629 844,573  
Other Expenses 7,888 11,748 21,805 26,663  
Income Before Income from Equity Method Investments and Income Taxes 71,137 83,287 284,275 244,242  
Income (Loss) from Equity Method Investments 0 (75) 297 (111)  
Pre-Tax Income 71,137 83,212 284,572 244,131  
Identifiable Segment Assets 1,294,106 1,239,812 1,294,106 1,239,812  
Investment Management [Member]          
Segment Reporting Information [Line Items]          
Net Revenues 14,425 18,302 40,590 48,840  
Operating Expenses 11,022 14,027 32,973 40,441  
Other Expenses 0 492 21 7,976  
Income Before Income from Equity Method Investments and Income Taxes 3,403 3,783 7,596 423  
Income (Loss) from Equity Method Investments 2,298 1,902 6,545 5,618  
Pre-Tax Income 5,701 5,685 14,141 6,041  
Identifiable Segment Assets $ 411,501 $ 321,223 $ 411,501 $ 321,223