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Investments (Tables) | 12 Months Ended
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Dec. 31, 2016
Investments Schedule [Abstract] |
Summary of Investments | The Company’s investments, excluding the assets of consolidated sponsored investment products and the assets of the consolidated investment product discussed in Note 18, at December 31, 2016 and 2015 were as follows:
| December 31,
| 2016 |  | 2015
($ in thousands) |  |  |
Marketable securities | $ | 74,907 |  |  | $ | 41,496 |
Equity method investments | 7,731 |  |  | 9,007 |
Nonqualified retirement plan assets | 5,808 |  |  | 5,310 |
Other investments | 925 |  |  | 925 |
Total investments | $ | 89,371 |  |  | $ | 56,738 |
Schedule of Marketable Securities | The composition of the Company’s marketable securities is summarized as follows:
December 31, 2016
| Cost |  | Unrealized Loss |  | Unrealized Gain |  | Fair Value
($ in thousands) |  |  |  |  |  |  |
Trading: |  |  |  |  |  |  |
Sponsored funds | $ | 61,784 |  |  | $ | (1,942 | ) |  | $ | 177 |  |  | $ | 60,019 |
Equity securities | 10,578 |  |  | — |  |  | 895 |  |  | 11,473 |
Available-for-sale: |  |  |  |  |  |  |
Sponsored closed-end funds | 3,500 |  |  | (265 | ) |  | 180 |  |  | 3,415 |
Total marketable securities | $ | 75,862 |  |  | $ | (2,207 | ) |  | $ | 1,252 |  |  | $ | 74,907 |
December 31, 2015
| Cost |  | Unrealized Loss |  | Unrealized Gain |  | Fair Value
($ in thousands) |  |  |  |  |  |  |
Trading: |  |  |  |  |  |  |
Sponsored funds | $ | 31,167 |  |  | $ | (2,134 | ) |  | $ | 298 |  |  | $ | 29,331 |
Equity securities | 9,434 |  |  | (386 | ) |  | 120 |  |  | 9,168 |
Available-for-sale: |  |  |  |  |  |  |
Sponsored closed-end funds | 3,355 |  |  | (365 | ) |  | 7 |  |  | 2,997 |
Total marketable securities | $ | 43,956 |  |  | $ | (2,885 | ) |  | $ | 425 |  |  | $ | 41,496 |

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