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Fair Value Measurements - Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cash equivalents | $ 187,255 | $ 158,596
Investment securities - fair value |  |
Fair Value | 60,990 | 59,271
Fair Value | 16 | 2,099
Other Investments [Abstract] |  |
Total assets measured at fair value | 256,969 | 226,606
Sponsored funds |  |
Investment securities - fair value |  |
Fair Value | 47,654 | 40,191
Equity securities |  |
Investment securities - fair value |  |
Fair Value | 13,320 | 16,981
Debt securities |  |
Investment securities - fair value |  |
Fair Value | 16 | 2,099
Investment securities - available for sale |  |
Investment securities - fair value |  |
Fair Value |  | 2,023
Other Investments [Abstract] |  |
Investment securities - available for sale |  | 2,023
Nonqualified retirement plan assets |  |
Other Investments [Abstract] |  |
Nonqualified retirement plan assets | 8,724 | 6,716
Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cash equivalents | 187,255 | 158,596
Investment securities - fair value |  |
Fair Value | 0 | 0
Other Investments [Abstract] |  |
Total assets measured at fair value | 256,953 | 222,484
Level 1 | Sponsored funds |  |
Investment securities - fair value |  |
Fair Value | 47,654 | 40,191
Level 1 | Equity securities |  |
Investment securities - fair value |  |
Fair Value | 13,320 | 16,981
Level 1 | Investment securities - available for sale |  |
Other Investments [Abstract] |  |
Investment securities - available for sale |  | 0
Level 1 | Nonqualified retirement plan assets |  |
Other Investments [Abstract] |  |
Nonqualified retirement plan assets | 8,724 | 6,716
Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cash equivalents | 0 | 0
Investment securities - fair value |  |
Fair Value | 16 | 0
Other Investments [Abstract] |  |
Total assets measured at fair value | 16 | 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 | Investment securities - available for sale |  |
Other Investments [Abstract] |  |
Investment securities - available for sale |  | 0
Level 2 | Nonqualified retirement plan assets |  |
Other Investments [Abstract] |  |
Nonqualified retirement plan assets | 0 | 0
Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cash equivalents | 0 | 0
Investment securities - fair value |  |
Fair Value | 0 | 2,099
Other Investments [Abstract] |  |
Total assets measured at fair value | 0 | 4,122
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 | Investment securities - available for sale |  |
Other Investments [Abstract] |  |
Investment securities - available for sale |  | 2,023
Level 3 | Nonqualified retirement plan assets |  |
Other Investments [Abstract] |  |
Nonqualified retirement plan assets | $ 0 | $ 0

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