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Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Items Included in Consolidated Statement of Financial Condition [Abstract]    
Trade receivables $ 106,316 $ 86,043
Fees earned, not billed 259,942 240,239
Other receivables 13,222 15,277
Receivables, Gross, Current 379,480 341,559
Less: Allowance for doubtful accounts (1,310) (1,201)
Receivables, net $ 378,170 $ 340,358