Fair Value Measurements - Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Cash equivalents	$ 307,277	$ 207,101
Investment securities - fair value
Fair Value	80,335	39,990
Total assets measured at fair value	400,933	257,703
Liabilities
Total liabilities measured at fair value	88,400
Contingent Consideration
Liabilities
Total liabilities measured at fair value	88,400
Sponsored funds
Investment securities - fair value
Fair Value	66,326	25,909
Equity securities
Investment securities - fair value
Fair Value	14,009	14,078
Debt securities
Investment securities - fair value
Fair Value	0	3
Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	13,321	10,612
Level 1
Assets
Cash equivalents	307,277	207,101
Investment securities - fair value
Total assets measured at fair value	400,933	257,700
Liabilities
Total liabilities measured at fair value	0
Level 1 \| Contingent Consideration
Liabilities
Total liabilities measured at fair value	0
Level 1 \| Sponsored funds
Investment securities - fair value
Fair Value	66,326	25,909
Level 1 \| Equity securities
Investment securities - fair value
Fair Value	14,009	14,078
Level 1 \| Debt securities
Investment securities - fair value
Fair Value		0
Level 1 \| Nonqualified retirement plan assets
Investment securities - fair value
Nonqualified retirement plan assets	13,321	10,612
Level 2
Assets
Cash equivalents	0	0
Investment securities - fair value
Total assets measured at fair value	0	3
Liabilities
Total liabilities measured at fair value	0
Level 2 \| Contingent Consideration
Liabilities
Total liabilities measured at fair value	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 \| Debt securities
Investment securities - fair value
Fair Value		3
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	88,400
Level 3 \| Contingent Consideration
Liabilities
Total liabilities measured at fair value	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 \| Debt securities
Investment securities - fair value
Fair Value		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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-Section 50
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740

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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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