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Revenue and Accounts Receivable - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Investment Banking and Equities [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer $ 462,804 $ 642,246 $ 996,314 $ 1,354,014
Investment Banking and Equities [Member] | Advisory Fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer 374,556 576,245 837,118 1,200,809
Investment Banking and Equities [Member] | Underwriting Fees [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer 38,200 13,516 61,083 49,822
Investment Banking and Equities [Member] | Commissions and Related Revenue [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer 50,048 52,485 98,113 103,383
Investment Management [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer 16,575 15,968 32,533 33,083
Investment Management [Member] | Wealth Management [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer $ 16,575 $ 15,968 $ 32,533 $ 33,083