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Fair Value Measurements - Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Cash equivalents | $ 287,126 | $ 307,277
Investment securities - fair value |  |
Fair Value | 76,999 | 80,335
Total assets measured at fair value | 374,279 | 400,933
Liabilities |  |
Total liabilities measured at fair value | 78,100 | 88,400
Contingent consideration |  |
Liabilities |  |
Total liabilities measured at fair value | 78,100 | 88,400
Sponsored funds |  |
Investment securities - fair value |  |
Fair Value | 62,744 | 66,326
Equity securities |  |
Investment securities - fair value |  |
Fair Value | 14,255 | 14,009
Nonqualified retirement plan assets |  |
Investment securities - fair value |  |
Nonqualified retirement plan assets | 10,154 | 13,321
Level 1 |  |
Assets |  |
Cash equivalents | 287,126 | 307,277
Investment securities - fair value |  |
Total assets measured at fair value | 374,279 | 400,933
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 | 62,744 | 66,326
Level 1 | Equity securities |  |
Investment securities - fair value |  |
Fair Value | 14,255 | 14,009
Level 1 | Nonqualified retirement plan assets |  |
Investment securities - fair value |  |
Nonqualified retirement plan assets | 10,154 | 13,321
Level 2 |  |
Assets |  |
Cash equivalents | 0 | 0
Investment securities - fair value |  |
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 |  |
Total assets measured at fair value | 0 | 0
Liabilities |  |
Total liabilities measured at fair value | 78,100 | 88,400
Level 3 | Contingent consideration |  |
Liabilities |  |
Total liabilities measured at fair value | 78,100 | 88,400
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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