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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2014
Fair Value Disclosures [Abstract] |
Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis | The Company’s assets and liabilities measured at fair value, excluding the assets and liabilities of consolidated sponsored investment products discussed in Note 10, on a recurring basis as of March 31, 2014 and December 31, 2013 by fair value hierarchy level were as follows: March 31, 2014
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
($ in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 234,181 |  |  | $ | — |  |  | $ | — |  |  | $ | 234,181 |
Marketable securities trading: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored mutual funds and variable insurance funds |  |  | 82,198 |  |  |  | — |  |  |  | — |  |  |  | 82,198 |
Equity securities |  |  | 8,910 |  |  |  | — |  |  |  | — |  |  |  | 8,910 |
Marketable securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored closed-end funds |  |  | 2,841 |  |  |  | — |  |  |  | — |  |  |  | 2,841 |
Other investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified retirement plan assets |  |  | 4,299 |  |  |  | — |  |  |  | — |  |  |  | 4,299 |
Total assets measured at fair value |  | $ | 332,429 |  |  | $ | — |  |  | $ | — |  |  | $ | 332,429 |
December 31, 2013
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
($ in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 270,262 |  |  | $ | — |  |  | $ | — |  |  | $ | 270,262 |
Marketable securities trading: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored mutual funds and variable insurance funds |  |  | 17,904 |  |  |  | — |  |  |  | — |  |  |  | 17,904 |
Equity securities |  |  | 8,379 |  |  |  | — |  |  |  | — |  |  |  | 8,379 |
Marketable securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsored closed-end funds |  |  | 2,685 |  |  |  | — |  |  |  | — |  |  |  | 2,685 |
Other investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonqualified retirement plan assets |  |  | 4,220 |  |  |  | — |  |  |  | — |  |  |  | 4,220 |
Total assets measured at fair value |  | $ | 303,450 |  |  | $ | — |  |  | $ | — |  |  | $ | 303,450 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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