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Related Parties - Receivable from Employees and Related Parties (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Related Party Transactions [Abstract]    
Advances to Employees $ 22,889 $ 15,930
Personal Expenses Paid On Behalf Of Employees And Related Parties 692 766
Reimbursable Expenses Relating To Private Equity Funds 255 334
Receivable from Employees and Related Parties $ 23,836 $ 17,030