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Concentrations of Credit Risk (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Risks and Uncertainties [Abstract] |  |  |
Investment Banking And Investment Management Receivables Collection Periods | 90 days |  |
Placement Fees Receivables Collection Period | 180 days |  |
Contract Asset Recognized For Cost of Obtaining Contract With Benefit in Excess of Period | 1 year |  |
Collection Period For Restructuring Transactions | 90 days |  |
Receivables Reflected in Other Assets in Excess of Period | 1 year |  |
Accounts Receivable, Net of Allowance | $ 368,346 | $ 296,355 |
Contract with Customer, Receivable, Net, Noncurrent | 70,975 | 63,554 | $ 60,948
Bad Debt Expense | 6,878 | 10,451 | 3,365
Contract with Customer, Asset, Gross, Current | 29,327 | 31,525 | 2,833
Contract with Customer, Asset, Gross, Noncurrent | 5,283 | 2,504 | $ 541
Investment Securities | $ 1,060,836 | $ 409,150 |
Percentage Of Marketable Securities Related To Corporate And Municipal Bonds And Other Debt Securities | 90.00% |  |
Percentage Of Marketable Securities Related To Equity Securities, Exchange Traded Funds And Mutual Funds | 10.00% |  |

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