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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, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cash equivalents | $ 158,596 | $ 72,993
Other Investments [Abstract] |  |
Total assets measured at fair value | 226,606 | 169,462
Sponsored funds |  |
Investment securities - fair value |  |
Marketable securities trading | 40,191 | 50,614
Equity securities |  |
Investment securities - fair value |  |
Marketable securities trading | 16,981 | 15,810
Trading debt securities |  |
Investment securities - fair value |  |
Marketable securities available for sale | 2,099 | 2,677
Investment securities - available for sale |  |
Other Investments [Abstract] |  |
Investment securities - available for sale | 2,023 | 20,662
Nonqualified retirement plan assets |  |
Other Investments [Abstract] |  |
Nonqualified retirement plan assets | 6,716 | 6,706
Level 1 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cash equivalents | 158,596 | 72,993
Other Investments [Abstract] |  |
Total assets measured at fair value | 222,484 | 146,123
Level 1 | Sponsored funds |  |
Investment securities - fair value |  |
Marketable securities trading | 40,191 | 50,614
Level 1 | Equity securities |  |
Investment securities - fair value |  |
Marketable securities trading | 16,981 | 15,810
Level 1 | Trading debt securities |  |
Investment securities - fair value |  |
Marketable securities available for sale | 0 | 0
Level 1 | Investment securities - available for sale |  |
Other Investments [Abstract] |  |
Investment securities - available for sale | 0 | 0
Level 1 | Nonqualified retirement plan assets |  |
Other Investments [Abstract] |  |
Nonqualified retirement plan assets | 6,716 | 6,706
Level 2 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Cash equivalents | 0 | 0
Other Investments [Abstract] |  |
Total assets measured at fair value | 0 | 18,900
Level 2 | Sponsored funds |  |
Investment securities - fair value |  |
Marketable securities trading | 0 | 0
Level 2 | Equity securities |  |
Investment securities - fair value |  |
Marketable securities trading | 0 | 0
Level 2 | Trading debt securities |  |
Investment securities - fair value |  |
Marketable securities available for sale | 0 | 0
Level 2 | Investment securities - available for sale |  |
Other Investments [Abstract] |  |
Investment securities - available for sale | 0 | 18,900
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
Other Investments [Abstract] |  |
Total assets measured at fair value | 4,122 | 4,439
Level 3 | Sponsored funds |  |
Investment securities - fair value |  |
Marketable securities trading | 0 | 0
Level 3 | Equity securities |  |
Investment securities - fair value |  |
Marketable securities trading | 0 | 0
Level 3 | Trading debt securities |  |
Investment securities - fair value |  |
Marketable securities available for sale | 2,099 | 2,677
Level 3 | Investment securities - available for sale |  |
Other Investments [Abstract] |  |
Investment securities - available for sale | 2,023 | 1,762
Level 3 | Nonqualified retirement plan assets |  |
Other Investments [Abstract] |  |
Nonqualified retirement plan assets | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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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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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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