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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2011
Fair Value Measurements [Abstract] |
Financial Assets Measured At Fair Value On Recurring Basis |
|  | December 31, 2010 |
|  | Fair value measurements using input type |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 226,092 |  |  | $ | — |  |  | $ | — |  |  | $ | 226,092 |
Government and corporate debentures - fixed interest rate |  |  |  |  |  |  | 7,932 |  |  |  |  |  |  |  | 7,932 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government and corporate debentures - fixed interest rate |  |  | — |  |  |  | 1,323,370 |  |  |  | — |  |  |  | 1,323,370 |
Government-sponsored enterprises |  |  | — |  |  |  | 332,799 |  |  |  | — |  |  |  | 332,799 |
Government and corporate debentures - floating interest rate |  |  | — |  |  |  | 199,010 |  |  |  | — |  |  |  | 199,010 |
Auction rate securities |  |  | — |  |  |  | — |  |  |  | 7,990 |  |  |  | 7,990 |
Foreign currency derivative contracts |  |  | — |  |  |  | 1,219 |  |  |  | — |  |  |  | 1,219 |
Total financials assets |  | $ | 226,092 |  |  | $ | 1,864,330 |  |  | $ | 7,990 |  |  | $ | 2,098,412 |
|  | December 31, 2011 |
|  | Fair value measurements using input type |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 303,780 |  |  | $ | — |  |  | $ | — |  |  | $ | 303,780 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government and corporate debentures - fixed interest rate |  |  | — |  |  |  | 1,624,096 |  |  |  | — |  |  |  | 1,624,096 |
Government-sponsored enterprises |  |  | — |  |  |  | 337,471 |  |  |  | — |  |  |  | 337,471 |
Government and corporate debentures - floating interest rate |  |  | — |  |  |  | 195,759 |  |  |  | — |  |  |  | 195,759 |
Auction rate securities |  |  | — |  |  |  | — |  |  |  | 6,078 |  |  |  | 6,078 |
Foreign currency derivative contracts |  |  | — |  |  |  | (351 | ) |  |  | — |  |  |  | (351 | )
Total financials assets |  | $ | 303,780 |  |  | $ | 2,156,975 |  |  | $ | 6,078 |  |  | $ | 2,466,833 |
Fair Value Measurements Using Significant Unobservable Inputs |
|  | Auction rate securities |
Balance at January 1, 2010 |  | $ | 8,775 |
Unrealized losses included in earning (other than temporary impairment) |  |  | (785 | )
Balance at December 31, 2010 |  |  | 7,990 |
Securities sold during 2011 |  |  | (1,912 | )
Balance at December 31, 2011 |  | $ | 6,078 |

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- Definition Fair Value, Assets Measured Using Unobservable Inputs [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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=6925170&loc=d3e19190-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 6 -Footnote 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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