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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

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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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