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Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Items Included in Consolidated Statement of Financial Condition [Abstract]    
Trade receivables $ 136,677 $ 110,722
Fees earned, not billed 360,812 320,700
Other receivables 25,047 26,563
Gross receivables 522,536 457,985
Less: Allowance for doubtful accounts (936) (901)
Receivables, net $ 521,600 $ 457,084