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Significant Accounting Policies (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019
Significant Accounting Policies [Line Items] |  |  |  |  |
Assets |  | $ 2,645,458 |  | $ 2,598,613 | $ 2,211,103
Liabilities |  | $ 1,438,444 |  | 1,472,363 |
Cumulative Effect of New Accounting Principle in Period of Adoption | [1] |  | $ 1,310 |  |
Investment Banking And Investment Management Receivables Collection Periods |  | 90 days |  |  |
Placement Fees Receivables Collection Period |  | 180 days |  |  |
Collection Period For Restructuring Transactions |  | 90 days |  |  |
Contract Asset Recognized For Cost of Obtaining Contract With Benefit in Excess of Period |  | 1 year |  |  |
Retained Earnings [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | [1] |  | $ 1,310 |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Assets |  | $ 228,884 |  | 227,885 |
Liabilities |  | $ 102,217 |  | $ 129,494 |
[1] | (1) The cumulative adjustment relates to the adoption of Accounting Standards Update ("ASU") No. 2016-13, "Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13") on January 1, 2020, for which the Company recorded an adjustment to Retained Earnings to reflect the increase in the Company's Allowance for Doubtful Accounts as a result of the use of the current expected credit loss model. See Notes 2 and 3 for further information.

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