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Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Items Included in Consolidated Statement of Financial Condition [Abstract]    
Trade receivables $ 56,262 $ 48,683
Fees earned, not billed 193,943 168,971
Other receivables 13,019 10,826
Receivables, Gross, Current 263,224 228,480
Less: Allowance for doubtful accounts (680) (523)
Receivables, net $ 262,544 $ 227,957