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

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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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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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