Fair Value Measurements - Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets
Cash equivalents	$ 92,458	$ 197,240
Investment securities - fair value
Fair Value	90,497	97,304
Total assets measured at fair value	196,698	307,226
Liabilities
Total liabilities measured at fair value	41,708	56,200
Contingent consideration
Liabilities
Total liabilities measured at fair value	41,708	56,200
Sponsored funds
Investment securities - fair value
Fair Value	69,514	77,433
Equity securities
Investment securities - fair value
Fair Value	20,983	19,871
Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	13,743	12,682
Level 1
Assets
Cash equivalents	92,458	197,240
Investment securities - fair value
Total assets measured at fair value	196,698	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	69,514	77,433
Level 1 \| Equity securities
Investment securities - fair value
Fair Value	20,983	19,871
Level 1 \| Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	13,743	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	41,708	56,200
Level 3 \| Contingent consideration
Liabilities
Total liabilities measured at fair value	41,708	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 probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Topic 210
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
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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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