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Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Items Included in Consolidated Statement of Financial Condition [Abstract]    
Trade receivables $ 136,599 $ 115,356
Fees earned, not billed 408,852 372,291
Other receivables 17,109 14,450
Gross receivables 562,560 502,097
Less: Allowance for doubtful accounts (1,165) (663)
Receivables, net $ 561,395 $ 501,434