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Marketable Securities | 9 Months Ended
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Sep. 30, 2012
Marketable Securities [Abstract] |
Marketable Securities |
4. | Marketable Securities
The Company’s marketable securities consist of trading (including securities held by a broker-dealer affiliate), available-for-sale securities and investments of consolidated sponsored investment products. The composition of the Company’s marketable securities is summarized as follows:
September 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Loss |  |  | Gain |  |  | Value |
($ in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Trading: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored mutual funds and variable insurance funds |  | $ | 8,421 |  |  | ($ | 718 | ) |  | $ | 1,662 |  |  | $ | 9,365 |
Investments of consolidated sponsored investment products |  |  | 35,068 |  |  |  | (165 | ) |  |  | 657 |  |  | $ | 35,560 |
Equity securities |  |  | 3,619 |  |  |  | 0 |  |  |  | 489 |  |  | $ | 4,108 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored closed-end funds |  |  | 2,472 |  |  |  | (12 | ) |  |  | 152 |  |  | $ | 2,612 |
Total marketable securities |  | $ | 49,580 |  |  | ($ | 895 | ) |  | $ | 2,960 |  |  | $ | 51,645 |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |
|  | Cost |  |  | Unrealized Loss |  |  | Unrealized Gain |  |  | Fair Value |
($ in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Trading: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored mutual funds and variable insurance funds |  | $ | 9,195 |  |  | ($ | 1,263 | ) |  | $ | 1,048 |  |  | $ | 8,980 |
Equity securities |  |  | 3,434 |  |  |  | (3 | ) |  |  | 115 |  |  |  | 3,546 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored closed-end funds |  |  | 2,240 |  |  |  | (38 | ) |  |  | 267 |  |  |  | 2,469 |
Total marketable securities |  | $ | 14,869 |  |  | ($ | 1,304 | ) |  | $ | 1,430 |  |  | $ | 14,995 |

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 3, 19, 20, 21, 22, 137 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Equity Security -URI http://asc.fasb.org/extlink&oid=6511694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -Glossary Debt Security -URI http://asc.fasb.org/extlink&oid=6509901 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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