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Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Items Included in Consolidated Statement of Financial Condition [Abstract]    
Trade receivables $ 115,356 $ 110,722
Fees earned, not billed 372,291 320,700
Other receivables 14,450 26,563
Gross receivables 502,097 457,985
Less: Allowance for doubtful accounts (663) (901)
Receivables, net $ 501,434 $ 457,084