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Fair Value Measurements - Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |
Cash equivalents | $ 157,635 | $ 287,126
Investment securities - fair value |  |
Fair Value | 118,464 | 76,999
Debt securities | 24,339 |
Total assets measured at fair value | 287,427 | 374,279
Liabilities |  |
Total liabilities measured at fair value | 54,910 | 78,100
Contingent consideration |  |
Liabilities |  |
Total liabilities measured at fair value | 54,910 | 78,100
Sponsored funds |  |
Investment securities - fair value |  |
Fair Value | 76,958 | 62,744
Equity securities |  |
Investment securities - fair value |  |
Fair Value | 17,167 | 14,255
Nonqualified retirement plan assets |  |
Investment securities - fair value |  |
Nonqualified retirement plan assets | 11,328 | 10,154
Level 1 |  |
Assets |  |
Cash equivalents | 157,635 | 287,126
Investment securities - fair value |  |
Debt securities | 0 |
Total assets measured at fair value | 263,088 | 374,279
Liabilities |  |
Total liabilities measured at fair value | 0 | 0
Level 1 | Contingent consideration |  |
Liabilities |  |
Total liabilities measured at fair value | 0 | 0
Level 1 | Sponsored funds |  |
Investment securities - fair value |  |
Fair Value | 76,958 | 62,744
Level 1 | Equity securities |  |
Investment securities - fair value |  |
Fair Value | 17,167 | 14,255
Level 1 | Nonqualified retirement plan assets |  |
Investment securities - fair value |  |
Nonqualified retirement plan assets | 11,328 | 10,154
Level 2 |  |
Assets |  |
Cash equivalents | 0 | 0
Investment securities - fair value |  |
Debt securities | 0 |
Total assets measured at fair value | 0 | 0
Liabilities |  |
Total liabilities measured at fair value | 0 | 0
Level 2 | Contingent consideration |  |
Liabilities |  |
Total liabilities measured at fair value | 0 | 0
Level 2 | Sponsored funds |  |
Investment securities - fair value |  |
Fair Value | 0 | 0
Level 2 | Equity securities |  |
Investment securities - fair value |  |
Fair Value | 0 | 0
Level 2 | Nonqualified retirement plan assets |  |
Investment securities - fair value |  |
Nonqualified retirement plan assets | 0 | 0
Level 3 |  |
Assets |  |
Cash equivalents | 0 | 0
Investment securities - fair value |  |
Debt securities | 24,339 |
Total assets measured at fair value | 24,339 | 0
Liabilities |  |
Total liabilities measured at fair value | 54,910 | 78,100
Level 3 | Contingent consideration |  |
Liabilities |  |
Total liabilities measured at fair value | 54,910 | 78,100
Level 3 | Sponsored funds |  |
Investment securities - fair value |  |
Fair Value | 0 | 0
Level 3 | Equity securities |  |
Investment securities - fair value |  |
Fair Value | 0 | 0
Level 3 | Nonqualified retirement plan assets |  |
Investment securities - fair value |  |
Nonqualified retirement plan assets | $ 0 | $ 0

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