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Investments (Tables) | 6 Months Ended
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Jun. 30, 2016
Investments Schedule [Abstract] |
Summary of Investments | The Company’s investments, excluding the investments of consolidated sponsored investment products and the investments of the consolidated investment product, which are separately discussed in Note 13, at June 30, 2016 and December 31, 2015 were as follows:
| June 30, 2016 |  | December 31, 2015
($ in thousands) |  |  |
Marketable securities | $ | 80,234 |  |  | $ | 41,496 |
Equity method investments | 5,147 |  |  | 9,007 |
Nonqualified retirement plan assets | 5,430 |  |  | 5,310 |
Other investments | 925 |  |  | 925 |
Total investments | $ | 91,736 |  |  | $ | 56,738 |
Schedule of Marketable Securities | The Company’s marketable securities consist of both trading and available-for-sale securities. The composition of the Company’s marketable securities is summarized as follows: June 30, 2016
| Cost |  | Unrealized Loss |  | Unrealized Gain |  | Fair Value
($ in thousands) |  |  |  |  |  |  |
Trading: |  |  |  |  |  |  |
Sponsored funds | $ | 69,355 |  |  | $ | (3,146 | ) |  | $ | 256 |  |  | $ | 66,465 |
Equity securities | 10,217 |  |  | (356 | ) |  | 339 |  |  | 10,200 |
Available-for-sale: |  |  |  |  |  |  |
Sponsored closed-end funds | 3,476 |  |  | (221 | ) |  | 314 |  |  | 3,569 |
Total marketable securities | $ | 83,048 |  |  | $ | (3,723 | ) |  | $ | 909 |  |  | $ | 80,234 |
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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