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Investments and Other Marketable Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Schedule of Investments [Line Items]
Net unrealized gains (loss)	$ (5,467)		$ (8,536)
Net unrealized gains (losses) income tax expense (benefit)	(1,632)		(2,549)
Mutual funds and equities, gross realized gains	303	$ 595
Securities owned	31,174		29,583
Cash equivalents at fair value	437,281		541,635
Investment Funds Sponsored by LSV
Schedule of Investments [Line Items]
Unrealized gains (losses) on investments	19	$ 833
Investments in limited partnership funds	$ 8,148		$ 8,129

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