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Related Parties	6 Months Ended
Related Parties	Jun. 30, 2021
Related Party Transactions [Abstract]
Related Parties	Related Parties Investment Banking Revenue includes advisory fees earned from clients that have Senior Managing Directors and certain Senior Advisors and executives as a member of their Board of Directors of $16,052 and $23,087 for the three and six months ended June 30, 2021, respectively, and $8,769 for the three and six months ended June 30, 2020. Other Assets on the Unaudited Condensed Consolidated Statements of Financial Condition includes the long-term portion of loans receivable from certain employees of $7,429 and $10,159 as of June 30, 2021 and December 31, 2020, respectively. See Note 15 for further information.