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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Investment Banking [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer $ 394,701 $ 451,628
Investment Banking [Member] | Advisory Fees [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer 325,844 378,315
Investment Banking [Member] | Underwriting Fees [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer 26,920 30,279
Investment Banking [Member] | Commissions and Related Fees [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer 41,937 43,034
Investment Management [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer 12,383 11,755
Investment Management [Member] | Wealth Management [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer 11,438 10,969
Investment Management [Member] | Institutional Asset Management [Member]    
Disaggregation of Revenue [Line Items]    
Revenue from Contract with Customer $ 945 $ 786