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Investments and Other Marketable Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Schedule of Investments [Line Items]
Net unrealized gains (losses)	$ (3,977)		$ (3,977)		$ (8,536)
Net unrealized gains (losses) income tax expense (benefit)	(1,188)		(1,188)		(2,549)
Mutual funds and equities, gross realized gains			566	$ 1,651
Mutual funds and equities, gross realized losses			94	1,416
Unrealized gains (losses) on investments	71		294
Securities owned	31,242		31,242		29,583
Cash equivalents at fair value	557,337		557,337		541,635
Investment Funds Sponsored by LSV
Schedule of Investments [Line Items]
Unrealized gains (losses) on investments	1,249	$ 673	2,393	$ 1,094
Investments in limited partnership funds	$ 10,522		$ 10,522		$ 8,129

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Accumulated Other Comprehensive Income (Loss), Debt Securities, Available For Sale Securities, Adjustment, Tax

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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