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Investments (Tables) | 3 Months Ended
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Mar. 31, 2015
Investments Schedule [Abstract] |
Summary of Investments | The Company’s investments, excluding the assets of consolidated sponsored investment products discussed in Note 12, at March 31, 2015 and December 31, 2014 were as follows:
|  | March 31, 2015 |  |  | December 31, 2014 |
($ in thousands) |  |  |  |  |  |
Marketable securities |  | $ | 43,703 |  |  | $ | 50,251 |
Equity method investments |  |  | 7,199 |  |  |  | 7,209 |
Nonqualified retirement plan assets |  |  | 5,168 |  |  |  | 5,063 |
Other investments |  |  | 925 |  |  |  | 925 |
Total investments |  | $ | 56,995 |  |  | $ | 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: March 31, 2015
|  | Cost |  |  | Unrealized Loss |  |  | Unrealized Gain |  |  | Fair Value |
($ in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Trading: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored funds |  | $ | 31,365 |  |  | $ | (844 | ) |  | $ | 690 |  |  | $ | 31,211 |
Equity securities |  |  | 9,064 |  |  |  | — |  |  |  | 179 |  |  |  | 9,243 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored closed-end funds |  |  | 3,173 |  |  |  | (161 | ) |  |  | 237 |  |  |  | 3,249 |
Total marketable securities |  | $ | 43,602 |  |  | $ | (1,005 | ) |  | $ | 1,106 |  |  | $ | 43,703 |
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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