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Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Items Included in Consolidated Statement of Financial Condition [Abstract]    
Trade receivables $ 54,973 $ 48,683
Fees earned, not billed 186,894 168,971
Other receivables 10,856 10,826
Receivables, Gross, Current 252,723 228,480
Less: Allowance for doubtful accounts (518) (523)
Receivables, net $ 252,205 $ 227,957