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v3.23.2

Marketable Securities (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Schedule of Investments [Line Items] |  |  |  |  |
Cash equivalents at fair value | $ 470,591,000 |  | $ 470,591,000 |  | $ 450,240,000
Net unrealized loss | 9,057,000 |  | 9,057,000 |  | 9,294,000
Net unrealized gains (losses) income tax expense (benefit) | (2,705,000) |  | (2,705,000) |  | (2,777,000)
Available-for-sale securities, gross realized gains |  |  | 0 | $ 0 |
Mutual funds and equities, gross realized gains |  |  | 44,000 | 7,000 |
Mutual funds and equities, gross realized loss |  |  | 49,000 | 658,000 |
Other long-term investments | 54,318,000 |  | 54,318,000 |  | 104,673,000
Securities owned | 31,040,000 |  | 31,040,000 |  | 32,148,000
Available-for-sale debt securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Available-for-sale securities, gross realized losses |  |  | 122,000 | 414,000 |
Investment Funds Sponsored by LSV |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Other long-term investments | 6,772,000 |  | 6,772,000 |  | $ 6,366,000
Unrealized gains (losses) on investments | $ 235,000 | $ (1,270,000) | $ 406,000 | $ (916,000) |

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