Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets
Cash equivalents	$ 242,567	$ 307,277
Investment securities - fair value
Fair Value	73,134	80,335
Total assets measured at fair value	327,289	400,933
Liabilities
Total liabilities measured at fair value	72,980	88,400
Contingent Consideration Liability
Liabilities
Total liabilities measured at fair value	72,980	88,400
Sponsored funds
Investment securities - fair value
Fair Value	61,699	66,326
Equity securities
Investment securities - fair value
Fair Value	11,435	14,009
Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	11,588	13,321
Level 1
Assets
Cash equivalents	242,567	307,277
Investment securities - fair value
Total assets measured at fair value	327,289	400,933
Liabilities
Total liabilities measured at fair value	0	0
Level 1 \| Contingent Consideration Liability
Liabilities
Total liabilities measured at fair value	0	0
Level 1 \| Sponsored funds
Investment securities - fair value
Fair Value	61,699	66,326
Level 1 \| Equity securities
Investment securities - fair value
Fair Value	11,435	14,009
Level 1 \| Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	11,588	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 Liability
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	72,980	88,400
Level 3 \| Contingent Consideration Liability
Liabilities
Total liabilities measured at fair value	72,980	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

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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