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Related Parties	3 Months Ended
Related Parties	Mar. 31, 2019
Related Party Transactions [Abstract]
Related Parties	Related Parties Other Assets on the Unaudited Condensed Consolidated Statements of Financial Condition includes the long-term portion of loans receivable from certain employees of $16,307 and $16,359 as of March 31, 2019 and December 31, 2018, respectively.