Fair Value Measurements - Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Assets
Cash equivalents	$ 147,135	$ 197,240
Investment securities - fair value
Fair Value	86,248	97,304
Total assets measured at fair value	247,396	307,226
Liabilities
Total liabilities measured at fair value	38,408	56,200
Contingent consideration
Liabilities
Total liabilities measured at fair value	38,408	56,200
Sponsored funds
Investment securities - fair value
Fair Value	64,420	77,433
Equity securities
Investment securities - fair value
Fair Value	21,828	19,871
Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	14,013	12,682
Level 1
Assets
Cash equivalents	147,135	197,240
Investment securities - fair value
Total assets measured at fair value	247,396	307,226
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	64,420	77,433
Level 1 \| Equity securities
Investment securities - fair value
Fair Value	21,828	19,871
Level 1 \| Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	14,013	12,682
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	38,408	56,200
Level 3 \| Contingent consideration
Liabilities
Total liabilities measured at fair value	38,408	56,200
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 asset recognized for present right to economic benefit.

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-Topic 820
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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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Fair value of financial and nonfinancial obligations.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Investments In Nonqualified Retirement Plan Assets

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