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Composition of Certain Financial Statement Captions (Receivables) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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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

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