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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Cash equivalents | $ 138,301 | $ 72,993
Marketable securities: |  |
Marketable securities trading | 62,330 | 66,424
Other investments: |  |
Total assets measured at fair value | 213,083 | 169,462
Sponsored funds |  |
Marketable securities: |  |
Marketable securities trading | 39,951 | 46,849
Equity securities |  |
Marketable securities: |  |
Marketable securities trading | 18,641 | 15,810
Sponsored closed-end funds |  |
Marketable securities: |  |
Marketable securities trading | 3,738 | 3,765
Collateralized loan obligation |  |
Other investments: |  |
Investments in collateralized loan obligations | 5,043 | 23,339
Nonqualified retirement plan assets |  |
Other investments: |  |
Nonqualified retirement plan assets | 7,409 | 6,706
Level 1 |  |
Assets |  |
Cash equivalents | 138,301 | 72,993
Other investments: |  |
Total assets measured at fair value | 208,040 | 146,123
Level 1 | Sponsored funds |  |
Marketable securities: |  |
Marketable securities trading | 39,951 | 46,849
Level 1 | Equity securities |  |
Marketable securities: |  |
Marketable securities trading | 18,641 | 15,810
Level 1 | Sponsored closed-end funds |  |
Marketable securities: |  |
Marketable securities trading | 3,738 | 3,765
Level 1 | Collateralized loan obligation |  |
Other investments: |  |
Investments in collateralized loan obligations | 0 | 0
Level 1 | Nonqualified retirement plan assets |  |
Other investments: |  |
Nonqualified retirement plan assets | 7,409 | 6,706
Level 2 |  |
Assets |  |
Cash equivalents | 0 | 0
Other investments: |  |
Total assets measured at fair value | 0 | 18,900
Level 2 | Sponsored funds |  |
Marketable securities: |  |
Marketable securities trading | 0 | 0
Level 2 | Equity securities |  |
Marketable securities: |  |
Marketable securities trading | 0 | 0
Level 2 | Sponsored closed-end funds |  |
Marketable securities: |  |
Marketable securities trading | 0 | 0
Level 2 | Collateralized loan obligation |  |
Other investments: |  |
Investments in collateralized loan obligations | 0 | 18,900
Level 2 | Nonqualified retirement plan assets |  |
Other investments: |  |
Nonqualified retirement plan assets | 0 | 0
Level 3 |  |
Assets |  |
Cash equivalents | 0 | 0
Other investments: |  |
Total assets measured at fair value | 5,043 | 4,439
Level 3 | Sponsored funds |  |
Marketable securities: |  |
Marketable securities trading | 0 | 0
Level 3 | Equity securities |  |
Marketable securities: |  |
Marketable securities trading | 0 | 0
Level 3 | Sponsored closed-end funds |  |
Marketable securities: |  |
Marketable securities trading | 0 | 0
Level 3 | Collateralized loan obligation |  |
Other investments: |  |
Investments in collateralized loan obligations | 5,043 | 4,439
Level 3 | Nonqualified retirement plan assets |  |
Other investments: |  |
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 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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