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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Cash equivalents | $ 366,937 | $ 207,101
Investment securities - fair value |  |
Fair Value | 78,143 | 39,990
Total assets measured at fair value | 457,458 | 257,703
Sponsored funds |  |
Investment securities - fair value |  |
Fair Value | 64,691 | 25,909
Equity securities |  |
Investment securities - fair value |  |
Fair Value | 13,446 | 14,078
Debt securities |  |
Investment securities - fair value |  |
Fair Value | 6 | 3
Nonqualified retirement plan assets |  |
Investment securities - fair value |  |
Nonqualified retirement plan assets | 12,378 | 10,612
Level 1 |  |
Assets |  |
Cash equivalents | 366,937 | 207,101
Investment securities - fair value |  |
Total assets measured at fair value | 457,452 | 257,700
Level 1 | Sponsored funds |  |
Investment securities - fair value |  |
Fair Value | 64,691 | 25,909
Level 1 | Equity securities |  |
Investment securities - fair value |  |
Fair Value | 13,446 | 14,078
Level 1 | Debt securities |  |
Investment securities - fair value |  |
Fair Value | 0 | 0
Level 1 | Nonqualified retirement plan assets |  |
Investment securities - fair value |  |
Nonqualified retirement plan assets | 12,378 | 10,612
Level 2 |  |
Assets |  |
Cash equivalents | 0 | 0
Investment securities - fair value |  |
Total assets measured at fair value | 6 | 3
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 | 6 | 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
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 | 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 No definition available. + Details
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