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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Cash equivalents | $ 110,304,000 | $ 158,596,000
Investment securities - fair value |  |
Fair Value | 56,362,000 | 59,271,000
Investment securities - available for sale | 0 | 2,023,000
Total assets measured at fair value | 174,185,000 | 226,606,000
Sponsored funds |  |
Investment securities - fair value |  |
Fair Value | 33,075,000 | 40,191,000
Equity securities |  |
Investment securities - fair value |  |
Fair Value | 18,827,000 | 16,981,000
Debt securities |  |
Investment securities - fair value |  |
Fair Value | 4,460,000 | 2,099,000
Collateralized loan obligation |  |
Investment securities - fair value |  |
Investment securities - available for sale |  | 2,023,000
Nonqualified retirement plan assets |  |
Investment securities - fair value |  |
Nonqualified retirement plan assets | 7,519,000 | 6,716,000
Level 1 |  |
Assets |  |
Cash equivalents | 110,304,000 | 158,596,000
Investment securities - fair value |  |
Total assets measured at fair value | 169,725,000 | 222,484,000
Level 1 | Sponsored funds |  |
Investment securities - fair value |  |
Fair Value | 33,075,000 | 40,191,000
Level 1 | Equity securities |  |
Investment securities - fair value |  |
Fair Value | 18,827,000 | 16,981,000
Level 1 | Debt securities |  |
Investment securities - fair value |  |
Fair Value | 0 | 0
Level 1 | Collateralized loan obligation |  |
Investment securities - fair value |  |
Investment securities - available for sale |  | 0
Level 1 | Nonqualified retirement plan assets |  |
Investment securities - fair value |  |
Nonqualified retirement plan assets | 7,519,000 | 6,716,000
Level 2 |  |
Assets |  |
Cash equivalents | 0 | 0
Investment securities - fair value |  |
Total assets measured at fair value | 43,000 | 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 | Debt securities |  |
Investment securities - fair value |  |
Fair Value | 43,000 | 0
Level 2 | Collateralized loan obligation |  |
Investment securities - fair value |  |
Investment securities - available for sale |  | 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 | 4,417,000 | 4,122,000
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 | 4,417,000 | 2,099,000
Level 3 | Collateralized loan obligation |  |
Investment securities - fair value |  |
Investment securities - available for sale |  | 2,023,000
Level 3 | Nonqualified retirement plan assets |  |
Investment securities - fair value |  |
Nonqualified retirement plan assets | $ 0 | $ 0

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