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Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments Schedule [Abstract] |
Summary of Investments | The Company’s investments, excluding the assets of consolidated investment products discussed in Note 18, at December 31, 2017 and 2016 were as follows:
| December 31,
| 2017 |  | 2016
($ in thousands) |  |  |
Marketable securities | $ | 66,424 |  |  | $ | 74,907 |
Equity method investments | 11,098 |  |  | 7,731 |
Nonqualified retirement plan assets | 6,706 |  |  | 5,808 |
Investments in collateralized loan obligations | 23,339 |  |  | — |
Other investments | 925 |  |  | 925 |
Total investments | $ | 108,492 |  |  | $ | 89,371 |
Schedule of Marketable Securities | The composition of the Company’s marketable securities is summarized as follows:
December 31, 2017
| Cost |  | Unrealized Loss |  | Unrealized Gain |  | Fair Value
($ in thousands) |  |  |  |  |  |  |
Trading: |  |  |  |  |  |  |
Sponsored funds | $ | 47,084 |  |  | $ | (1,294 | ) |  | $ | 1,059 |  |  | $ | 46,849 |
Equity securities | 13,141 |  |  | (2 | ) |  | 2,671 |  |  | 15,810 |
Available-for-sale: |  |  |  |  |  |  |
Sponsored closed-end funds | 3,761 |  |  | (302 | ) |  | 306 |  |  | 3,765 |
Total marketable securities | $ | 63,986 |  |  | $ | (1,598 | ) |  | $ | 4,036 |  |  | $ | 66,424 |
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 |

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