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Investments (Tables) | 3 Months Ended
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Mar. 31, 2018
Investments Schedule [Abstract] |
Summary of Investments | At March 31, 2018 and December 31, 2017, the Company's investments were as follows:
| March 31, 2018 |  | December 31, 2017
($ in thousands) |  |  |
Marketable securities | $ | 62,039 |  |  | $ | 66,424 |
Equity method investments | 12,420 |  |  | 11,098 |
Nonqualified retirement plan assets | 6,669 |  |  | 6,706 |
Investments in collateralized loan obligations | 43,295 |  |  | 23,339 |
Other investments | 925 |  |  | 925 |
Total investments | $ | 125,348 |  |  | $ | 108,492 |
Schedule of Marketable Securities | The composition of the Company’s marketable securities is summarized as follows: March 31, 2018
| Cost |  | Unrealized Loss |  | Unrealized Gain |  | Fair Value
($ in thousands) |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |
Sponsored funds | $ | 41,463 |  |  | $ | (928 | ) |  | $ | 1,380 |  |  | $ | 41,915 |
Equity securities | 13,621 |  |  | (11 | ) |  | 2,939 |  |  | 16,549 |
Sponsored closed-end funds | 3,770 |  |  | (382 | ) |  | 187 |  |  | 3,575 |
Total marketable securities | $ | 58,854 |  |  | $ | (1,321 | ) |  | $ | 4,506 |  |  | $ | 62,039 |
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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