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Concentrations of Credit Risk (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Risks and Uncertainties [Abstract]      
Investment Banking And Investment Management Receivables Collection Periods 90 days    
Placement Fees Receivables Collection Period 180 days    
Private Funds Capital Raising and Private Capital Receivables Collection Period 1 year    
Restructuring Receivables Collection Period 90 days    
Receivables Reflected in Other Assets in Excess of Period 1 year    
Accounts Receivable, after Allowance for Credit Loss $ 385,131 $ 351,668  
Contract with Customer, Receivable, Net, Noncurrent 64,139 87,764 $ 70,975
Bad Debt Expense 5,513 (60) 6,878
Contract with Customer, Asset, Gross, Current 110,468 14,092 29,327
Contract with Customer, Asset, Gross, Noncurrent 8,028 12,945 $ 5,283
Investment Securities $ 1,309,826 1,643,421  
Percentage Of Marketable Securities Related To U.S. Treasury Bills And Notes 90.00%    
Percentage Of Marketable Securities Related To Equity Securities and Exchange Traded Funds 10.00%    
Certificates of Deposit, at Carrying Value $ 122,890 $ 141,218