Fair Value Measurements - Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Assets
Cash equivalents	$ 171,633	$ 287,126
Investment securities - fair value
Fair Value	80,654	76,999
Total assets measured at fair value	263,027	374,279
Liabilities
Total liabilities measured at fair value	61,710	78,100
Contingent consideration
Liabilities
Total liabilities measured at fair value	61,710	78,100
Sponsored funds
Investment securities - fair value
Fair Value	65,551	62,744
Equity securities
Investment securities - fair value
Fair Value	15,103	14,255
Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	10,740	10,154
Level 1
Assets
Cash equivalents	171,633	287,126
Investment securities - fair value
Total assets measured at fair value	263,027	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	65,551	62,744
Level 1 \| Equity securities
Investment securities - fair value
Fair Value	15,103	14,255
Level 1 \| Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	10,740	10,154
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	61,710	78,100
Level 3 \| Contingent consideration
Liabilities
Total liabilities measured at fair value	61,710	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

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Fair value of financial and nonfinancial obligations.

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Investments In Nonqualified Retirement Plan Assets

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