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Investments (Tables) | 9 Months Ended
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Sep. 30, 2015
Investments Schedule [Abstract] |
Summary of Investments | The Company’s investments, excluding the assets of consolidated sponsored investment products discussed in Note 13 and the assets of the consolidated investment product discussed in Note 14, at September 30, 2015 and December 31, 2014 were as follows:
| September 30, 2015 |  | December 31, 2014
($ in thousands) |  |  |
Marketable securities | $ | 40,136 |  |  | $ | 50,251 |
Equity method investments | 9,194 |  |  | 7,209 |
Nonqualified retirement plan assets | 4,970 |  |  | 5,063 |
Other investments | 925 |  |  | 925 |
Total investments | $ | 55,225 |  |  | $ | 63,448 |
Schedule of Marketable Securities | The Company’s marketable securities consist of both trading (including securities held by a broker-dealer affiliate) and available-for-sale securities. The composition of the Company’s marketable securities is summarized as follows: September 30, 2015
| Cost |  | Unrealized Loss |  | Unrealized Gain |  | Fair Value
($ in thousands) |  |  |  |  |  |  |
Trading: |  |  |  |  |  |  |
Sponsored funds | $ | 32,079 |  |  | $ | (1,829 | ) |  | $ | 288 |  |  | $ | 30,538 |
Equity securities | 7,236 |  |  | (648 | ) |  | 57 |  |  | 6,645 |
Available-for-sale: |  |  |  |  |  |  |
Sponsored closed-end funds | 3,297 |  |  | (344 | ) |  | — |  |  | 2,953 |
Total marketable securities | $ | 42,612 |  |  | $ | (2,821 | ) |  | $ | 345 |  |  | $ | 40,136 |
December 31, 2014
| Cost |  | Unrealized Loss |  | Unrealized Gain |  | Fair Value
($ in thousands) |  |  |  |  |  |  |
Trading: |  |  |  |  |  |  |
Sponsored funds | $ | 39,079 |  |  | $ | (1,190 | ) |  | $ | 423 |  |  | $ | 38,312 |
Equity securities | 8,421 |  |  | — |  |  | 319 |  |  | 8,740 |
Available-for-sale: |  |  |  |  |  |  |
Sponsored closed-end funds | 3,129 |  |  | (163 | ) |  | 233 |  |  | 3,199 |
Total marketable securities | $ | 50,629 |  |  | $ | (1,353 | ) |  | $ | 975 |  |  | $ | 50,251 |

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