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Marketable Securities (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Investments [Line Items]
Cash equivalents fair value	$ 565,588	$ 450,240
Net unrealized holding gain (loss)	(6,875)	(9,294)
Net unrealized holding gains (losses), income tax (benefit) expense	(2,054)	2,777
Available-for-sale securities, gross realized gains	0	0	$ 0
Equity securities, gross realized gains	661	263	741
Equity securities, gross realized losses	349	773	72
Investment funds sponsored by LSV	110,781	104,673
Securities owned	31,334	32,148
Available for sale debt securities
Schedule of Investments [Line Items]
Available-for-sale securities, gross realized losses	215	602	1,160
Available-for-sale securities, gross realized gains	0	0	0
Investment funds sponsored by LSV
Schedule of Investments [Line Items]
Investment funds sponsored by LSV	7,316	6,366
Gains (losses) from the change in fair value of the funds	$ 950	$ (550)	$ 750

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