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Current Vulnerability Due to Certain Concentrations (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  |  | 12 Months Ended
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Dec. 31, 2011 Y | Dec. 31, 2010 Credit Concentration Risk [Member] | Dec. 31, 2011 Credit Concentration Risk [Member] Cash and Cash Equivalents and Short-term Investments [Member] Bank Leumi [Member] | Dec. 31, 2011 Credit Concentration Risk [Member] Cash and Cash Equivalents and Short-term Investments [Member] Unicredit [Member] | Dec. 31, 2011 Credit Concentration Risk [Member] Cash and Cash Equivalents and Short-term Investments [Member] KBC [Member] | Dec. 31, 2011 Credit Concentration Risk [Member] Cash and Cash Equivalents and Short-term Investments [Member] JP Morgan Chase [Member] | Dec. 31, 2011 Credit Concentration Risk [Member] Accounts Receivable [Member] | Dec. 31, 2010 Credit Concentration Risk [Member] Accounts Receivable [Member] | Dec. 31, 2011 Geographic Concentration [Member] Cash and Cash Equivalents and Short-term Investments [Member] United States [Member] | Dec. 31, 2011 Geographic Concentration [Member] Cash and Cash Equivalents and Short-term Investments [Member] Germany [Member] | Dec. 31, 2011 Geographic Concentration [Member] Cash and Cash Equivalents and Short-term Investments [Member] Other Europe [Member] | Dec. 31, 2011 Geographic Concentration [Member] Cash and Cash Equivalents and Short-term Investments [Member] Israel [Member] | Dec. 31, 2011 Geographic Concentration [Member] Cash and Cash Equivalents and Short-term Investments [Member] People's Republic of China [Member] | Dec. 31, 2011 Geographic Concentration [Member] Cash and Cash Equivalents and Short-term Investments [Member] Other Asia [Member] | Dec. 31, 2011 Geographic Concentration [Member] Cash and Cash Equivalents and Short-term Investments [Member] Other Geographic Area [Member] | Dec. 31, 2011 Geographic Concentration [Member] Cash and Cash Equivalents and Short-term Investments [Member] Singapore [Member] | Dec. 31, 2011 Geographic Concentration [Member] Cash and Cash Equivalents and Short-term Investments [Member] Outside Of United States [Member] | Dec. 31, 2011 Geographic Concentration [Member] Revenue [Member] Outside Of United States [Member]
Concentration Risks [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Geographic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | .78
Concentration Risk, Customer | 0.109 | 0.087 |  |  |  |  | 0.109 | 0.087 |  |  |  |  |  |  |  |  |  |
Concentration risk percentage (in hundredths) |  |  | 21.50% | 14.40% | 13.40% | 11.90% |  |  | 12.40% | 28.00% | 7.80% | 29.90% | 6.10% | 6.30% | 0.60% | 8.90% |  |
Cash and cash equivalents and short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 875,073 |
Duration of business operations in Israel (in years) | 41 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Description of risks that arise due to concentrations of operating facilities, revenues, assets, customers, vendors or the like in a certain geographic area, either domestic or foreign. The description may address risks inherent in the geographic area, and, at a minimum, informs users of the general nature of the risk, but excludes "Information about Geographic Areas" that may be disclosed elsewhere (for instance, segment disclosures).. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-6 -Paragraph 21, 22, 24 -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 Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6327-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13537-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition The number of years that the business operation in Israel has existed. + References No definition available. + Details
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