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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2017
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis | The Company’s assets and liabilities measured at fair value on a recurring basis, excluding the assets and liabilities of consolidated sponsored investment products and the consolidated investment product, which are separately discussed in Note 14, as of March 31, 2017 and December 31, 2016 by fair value hierarchy level were as follows: March 31, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total
($ in thousands) |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Cash equivalents | $ | 223,087 |  |  | $ | — |  |  | $ | — |  |  | $ | 223,087 |
Marketable securities trading: |  |  |  |  |  |  |
Sponsored mutual funds | 54,998 |  |  | — |  |  | — |  |  | 54,998 |
Equity securities | 11,974 |  |  | — |  |  | — |  |  | 11,974 |
Marketable securities available-for-sale: |  |  |  |  |  |  |
Sponsored closed-end funds | 3,623 |  |  | — |  |  | — |  |  | 3,623 |
Other investments: |  |  |  |  |  |  |
Nonqualified retirement plan assets | 6,186 |  |  | — |  |  | — |  |  | 6,186 |
Total assets measured at fair value | $ | 299,868 |  |  | $ | — |  |  | $ | — |  |  | $ | 299,868 |
December 31, 2016
| Level 1 |  | Level 2 |  | Level 3 |  | Total
($ in thousands) |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Cash equivalents | $ | 48,620 |  |  | $ | — |  |  | $ | — |  |  | $ | 48,620 |
Marketable securities trading: |  |  |  |  |  |  |
Sponsored mutual funds | 60,019 |  |  | — |  |  | — |  |  | 60,019 |
Equity securities | 11,473 |  |  | — |  |  | — |  |  | 11,473 |
Marketable securities available-for-sale: |  |  |  |  |  |  |
Sponsored closed-end funds | 3,415 |  |  | — |  |  | — |  |  | 3,415 |
Other investments |  |  |  |  |  |  |
Nonqualified retirement plan assets | 5,808 |  |  | — |  |  | — |  |  | 5,808 |
Total assets measured at fair value | $ | 129,335 |  |  | $ | — |  |  | $ | — |  |  | $ | 129,335 |

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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=66048111&loc=d3e19190-110258 + Details
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