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Related Parties
 6 Months Ended
Jun. 30, 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 $14,038 and $16,359 as of June 30, 2019 and December 31, 2018, respectively.