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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2012
Financial Assets and Liabilities Measured at Fair Value | The following table presents the Company’s financial assets and liabilities which are measured at fair values on a recurring basis and that are subject to the disclosure requirements of the authoritative guidance as of December 31, 2012 and 2011 (in thousands).
|  | Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Overnight repurchase agreements |  | $ | 128,269 |  |  | $ | — |  |  | $ | 128,269 |  |  | $ | — |
Certificates of deposit |  |  | 11,849 |  |  |  | — |  |  |  | 11,849 |  |  |  | — |
Total |  | $ | 140,118 |  |  | $ | — |  |  | $ | 140,118 |  |  | $ | — |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Overnight repurchase agreements |  | $ | 100,077 |  |  | $ | — |  |  | $ | 100,077 |  |  | $ | — |
Certificates of deposit |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 100,077 |  |  | $ | — |  |  | $ | 100,077 |  |  | $ | — |

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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=7578670&loc=d3e19190-110258 + Details
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