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Investments (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments Schedule [Abstract] |
Summary of Investments | At June 30, 2018 and December 31, 2017, the Company's investments were as follows:
| June 30, 2018 |  | December 31, 2017
($ in thousands) |  |  |
Marketable securities | $ | 61,401 |  |  | $ | 66,424 |
Equity method investments | 12,230 |  |  | 11,098 |
Nonqualified retirement plan assets | 6,909 |  |  | 6,706 |
Investments in collateralized loan obligations | 5,744 |  |  | 23,339 |
Other investments | 925 |  |  | 925 |
Total investments | $ | 87,209 |  |  | $ | 108,492 |
Schedule of Marketable Securities | The composition of the Company’s marketable securities is summarized as follows: June 30, 2018
| Cost |  | Unrealized Loss |  | Unrealized Gain |  | Fair Value
($ in thousands) |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |
Sponsored funds | $ | 40,235 |  |  | $ | (895 | ) |  | $ | 1,333 |  |  | $ | 40,673 |
Equity securities | 14,018 |  |  | (10 | ) |  | 3,000 |  |  | 17,008 |
Sponsored closed-end funds | 3,778 |  |  | (360 | ) |  | 302 |  |  | 3,720 |
Total marketable securities | $ | 58,031 |  |  | $ | (1,265 | ) |  | $ | 4,635 |  |  | $ | 61,401 |
December 31, 2017
| Cost |  | Unrealized Loss |  | Unrealized Gain |  | Fair Value
($ in thousands) |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |
Sponsored funds | $ | 47,084 |  |  | $ | (1,294 | ) |  | $ | 1,059 |  |  | $ | 46,849 |
Equity securities | 13,141 |  |  | (2 | ) |  | 2,671 |  |  | 15,810 |
Sponsored closed-end funds | 3,761 |  |  | (302 | ) |  | 306 |  |  | 3,765 |
Total marketable securities | $ | 63,986 |  |  | $ | (1,598 | ) |  | $ | 4,036 |  |  | $ | 66,424 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
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