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Investments (Tables) | 6 Months Ended
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Jun. 30, 2017
Investments Schedule [Abstract] |
Summary of Investments | At June 30, 2017 and December 31, 2016, the Company's investments were as follows:
| June 30, 2017 |  | December 31, 2016
($ in thousands) |  |  |
Marketable securities | $ | 72,162 |  |  | $ | 74,907 |
Equity method investments | 11,004 |  |  | 7,731 |
Nonqualified retirement plan assets | 6,396 |  |  | 5,808 |
Other investments | 3,834 |  |  | 925 |
Total investments | $ | 93,396 |  |  | $ | 89,371 |
Schedule of Marketable Securities | The composition of the Company’s marketable securities is summarized as follows: June 30, 2017
| Cost |  | Unrealized Loss |  | Unrealized Gain |  | Fair Value
($ in thousands) |  |  |  |  |  |  |
Trading: |  |  |  |  |  |  |
Sponsored funds | $ | 56,235 |  |  | $ | (1,115 | ) |  | $ | 540 |  |  | $ | 55,660 |
Equity securities | 10,969 |  |  | — |  |  | 1,771 |  |  | 12,740 |
Available-for-sale: |  |  |  |  |  |  |
Sponsored closed-end funds | 3,630 |  |  | (220 | ) |  | 352 |  |  | 3,762 |
Total marketable securities | $ | 70,834 |  |  | $ | (1,335 | ) |  | $ | 2,663 |  |  | $ | 72,162 |
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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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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