Fair Value Measurements - Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets
Cash equivalents	$ 197,240	$ 287,126
Investment securities - fair value
Fair Value	97,304	76,999
Total assets measured at fair value	307,226	374,279
Liabilities
Total liabilities measured at fair value	56,200	78,100
Contingent consideration
Liabilities
Total liabilities measured at fair value	56,200	78,100
Sponsored funds
Investment securities - fair value
Fair Value	77,433	62,744
Equity securities
Investment securities - fair value
Fair Value	19,871	14,255
Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	12,682	10,154
Level 1
Assets
Cash equivalents	197,240	287,126
Investment securities - fair value
Total assets measured at fair value	307,226	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	77,433	62,744
Level 1 \| Equity securities
Investment securities - fair value
Fair Value	19,871	14,255
Level 1 \| Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	12,682	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	56,200	78,100
Level 3 \| Contingent consideration
Liabilities
Total liabilities measured at fair value	56,200	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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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
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Fair value of financial and nonfinancial obligations.

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