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Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Items Included in Consolidated Statement of Financial Condition [Abstract]    
Trade receivables $ 76,362 $ 76,760
Fees earned, not billed 226,001 194,331
Other receivables 13,691 12,310
Gross receivables 316,054 283,401
Less: Allowance for doubtful accounts (718) (695)
Receivables, net $ 315,336 $ 282,706