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Investments (Tables) | 3 Months Ended
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Mar. 31, 2019
Investments Schedule [Abstract] |
Summary of Investments | Investments consist primarily of investments in the Company's sponsored products. The Company's investments, excluding the assets of consolidated investment products discussed in Note 17, at March 31, 2019 and December 31, 2018, were as follows:
| March 31, 2019 |  | December 31, 2018
($ in thousands) |  |  |
Investment securities - fair value | $ | 56,362 |  |  | $ | 59,271 |
Investment securities - available for sale | — |  |  | 2,023 |
Equity method investments | 11,051 |  |  | 10,573 |
Nonqualified retirement plan assets | 7,519 |  |  | 6,716 |
Other investments | 993 |  |  | 975 |
Total investments | $ | 75,925 |  |  | $ | 79,558 |
Schedule of Marketable Securities | The composition of the Company’s investment securities - fair value is summarized as follows:
| March 31, 2019 |  | December 31, 2018
| Cost |  | Fair Value |  | Cost |  | Fair Value
($ in thousands) |  |  |  |  |  |  |
Investment Securities - fair value |  |  |  |  |  |  |
Sponsored funds | $ | 33,082 |  |  | $ | 33,075 |  |  | $ | 43,507 |  |  | $ | 40,191 |
Equity securities | 16,628 |  |  | 18,827 |  |  | 16,380 |  |  | 16,981 |
Debt securities | 4,460 |  |  | 4,460 |  |  | 3,816 |  |  | 2,099 |
Total Investment Securities - fair value | $ | 54,170 |  |  | $ | 56,362 |  |  | $ | 63,703 |  |  | $ | 59,271 |
Schedule of Investment Securities - Available-for-Sale | The composition of the Company’s investment securities - available for sale is summarized as follows:
| December 31, 2018
| Cost |  | Unrealized Loss |  | Unrealized Gain |  | Fair Value
($ in thousands) |  |  |  |  |  |  |
Investment Securities - available for sale |  |  |  |  |  |  |
Investments in CLOs | $ | 3,696 |  |  | $ | (1,673 | ) |  | $ | — |  |  | $ | 2,023 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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