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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2012
Marketable Securities [Abstract] |
Schedule of 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 Schedule of marketable securities. + References No definition available. + Details
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