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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2013
Fair Value Disclosures [Abstract] |
Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following tables present information about the Company’s assets and liabilities measured at fair value on a recurring basis as of December 31 (in thousands):
|  | Balance as of 2013 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 836,387 |  |  | $ | 516,173 |  |  | $ | 320,214 |  |  | $ | — |
Marketable securities |  | 129,181 |  |  | 30,172 |  |  | 99,009 |  |  | — |
Derivatives |  | 1,932 |  |  | — |  |  | 1,932 |  |  | — |
|  | $ | 967,500 |  |  | $ | 546,345 |  |  | $ | 421,155 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |
Derivatives |  | $ | 3,925 |  |  | $ | — |  |  | $ | 3,925 |  |  | $ | — |
|  | Balance as of 2012 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 834,562 |  |  | $ | 672,274 |  |  | $ | 162,288 |  |  | $ | — |
Marketable securities |  | 154,051 |  |  | 18,417 |  |  | 135,634 |  |  | — |
Derivatives |  | 317 |  |  | — |  |  | 317 |  |  | — |
|  | $ | 988,930 |  |  | $ | 690,691 |  |  | $ | 298,239 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |
Derivatives |  | $ | 7,920 |  |  | $ | — |  |  | $ | 7,920 |  |  | $ | — |

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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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