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Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2013
Cash And Cash Equivalents [Abstract] |
Schedule of Marketable Securities | The Company’s marketable securities consist of trading securities, investments of consolidated sponsored investment products, and available-for-sale securities. The composition of the Company’s marketable securities as of September 30, 2013 and December 31, 2012 is summarized as follows:
September 30, 2013 |
|  | Cost |  |  | Unrealized Loss |  |  | Unrealized Gain |  |  | Fair Value |
($ in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Trading: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored mutual funds and variable insurance funds |  | $ | 11,845 |  |  | $ | (685 | ) |  | $ | 2,653 |  |  | $ | 13,813 |
Equity securities |  |  | 3,898 |  |  |  | — |  |  |  | 1,206 |  |  |  | 5,104 |
Investments of consolidated sponsored investment products: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 29,598 |  |  |  | (2,154 | ) |  |  | 165 |  |  |  | 27,609 |
Equity securities |  |  | 66,679 |  |  |  | (415 | ) |  |  | 2,125 |  |  |  | 68,389 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored closed-end funds |  |  | 2,764 |  |  |  | (125 | ) |  |  | 45 |  |  |  | 2,684 |
Total marketable securities |  | $ | 114,784 |  |  | $ | (3,379 | ) |  | $ | 6,194 |  |  | $ | 117,599 |
December 31, 2012 |
|  | Cost |  |  | Unrealized Loss |  |  | Unrealized Gain |  |  | Fair Value |
($ in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Trading: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored mutual funds and variable insurance funds |  | $ | 7,312 |  |  | $ | (689 | ) |  | $ | 1,390 |  |  | $ | 8,013 |
Equity securities |  |  | 3,739 |  |  |  | — |  |  |  | 640 |  |  |  | 4,379 |
Investments of consolidated sponsored investment products: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 24,830 |  |  |  | (21 | ) |  |  | 1,003 |  |  |  | 25,812 |
Equity securities |  |  | 16,537 |  |  |  | (144 | ) |  |  | 1,022 |  |  |  | 17,415 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored closed-end funds |  |  | 2,619 |  |  |  | (37 | ) |  |  | 74 |  |  |  | 2,656 |
Total marketable securities |  | $ | 55,037 |  |  | $ | (891 | ) |  | $ | 4,129 |  |  | $ | 58,275 |

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