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Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Items Included in Consolidated Statement of Financial Condition [Abstract]    
Trade receivables $ 112,572 $ 99,106
Fees earned, not billed 313,883 262,167
Other receivables 18,401 25,046
Receivables, Gross, Current 444,856 386,319
Less: Allowance for doubtful accounts (2,669) (1,100)
Receivables, net $ 442,187 $ 385,219