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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2012
Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following table summarizes the financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2012:
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |
Assets: |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 5,098 |  |  | $ | — |
Money market instruments |  |  | 5,076 |  |  |  | — |
Corporate stock |  |  | 2,131 |  |  |  | — |
Corporate bonds |  |  | — |  |  |  | 146,073 |
Asset-backed securities |  |  | — |  |  |  | 52,376 |
Treasury bills |  |  | — |  |  |  | 42,273 |
Agency bonds |  |  | — |  |  |  | 36,923 |
Municipal bonds |  |  | — |  |  |  | 34,070 |
Sovereign bonds |  |  | — |  |  |  | 14,592 |
Covered bonds |  |  | — |  |  |  | 11,182 |
Currency forward contracts |  |  | 44 |  |  |  | — |
Liabilities: |  |  |  |  |  |  |  |
Currency forward contracts |  |  | 14 |  |  |  | — |

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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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