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Investments In Affiliated Companies, Partnership And Other Companies (Investments In Companies Accounted For Under The Equity Method) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010
Investments In Affiliated Companies, Partnership And Other Companies [Line Items] |  |  |  |
Equity method investments | $ 105,914 |  | $ 86,069 |
Ownership percentage | 50.00% |  |  |
Equity method investment ownership percentage | 50.00% |  |  |
SCD [Member] |  |  |  |
Investments In Affiliated Companies, Partnership And Other Companies [Line Items] |  |  |  |
Equity method investments | 63,854 | [1] | 58,815 | [1]
Ownership percentage | 50.00% |  |  |
Equity method investment ownership percentage | 50.00% |  |  |
VSI [Member] |  |  |  |
Investments In Affiliated Companies, Partnership And Other Companies [Line Items] |  |  |  |
Equity method investments | 8,154 | [2] | 4,181 | [2]
Ownership percentage | 50.00% |  |  |
Equity method investment ownership percentage | 50.00% |  |  |
Opgal [Member] |  |  |  |
Investments In Affiliated Companies, Partnership And Other Companies [Line Items] |  |  |  |
Equity method investments | 14,626 | [3] | 13,000 | [3]
Ownership percentage | 50.10% |  |  |
Equity method investment ownership percentage | 50.10% |  |  |
Netcity [Member] |  |  |  |
Investments In Affiliated Companies, Partnership And Other Companies [Line Items] |  |  |  |
Equity method investments | 10,418 | [4] | 2,697 | [4]
Ownership percentage in subsidiaries | 40.00% |  |  |
Additions to equity method investments | 8,100 |  | 2,700 |
Other [Member] |  |  |  |
Investments In Affiliated Companies, Partnership And Other Companies [Line Items] |  |  |  |
Equity method investments | $ 8,862 |  | $ 7,376 |
Rafael Advanced Defense Systems Ltd [Member] |  |  |  |
Investments In Affiliated Companies, Partnership And Other Companies [Line Items] |  |  |  |
Ownership percentage | 50.00% |  |  |
Equity method investment ownership percentage | 50.00% |  |  |
Rockwell Collins Inc [Member] |  |  |  |
Investments In Affiliated Companies, Partnership And Other Companies [Line Items] |  |  |  |
Ownership percentage | 50.00% |  |  |
Equity method investment ownership percentage | 50.00% |  |  |
Subsidiary Of Rafael [Member] |  |  |  |
Investments In Affiliated Companies, Partnership And Other Companies [Line Items] |  |  |  |
Ownership percentage | 49.90% |  |  |
Equity method investment ownership percentage | 49.90% |  |  |
[1] | Semi Conductor Devices ("SCD") is an Israeli partnership, held 50% by the Company and 50% by Rafael Advanced Defense Systems Ltd. ("Rafael"). SCD is engaged in the development and production of various thermal detectors and laser diodes. SCD is jointly controlled and therefore is not consolidated in the Company's financial statements.
[2] | Vision Systems International LLC ("VSI") based in San Jose, is a California limited liability company that is held 50% by ESA and 50% by a subsidiary of Rockwell Collins Inc. VSI operates in the area of helmet mounted display systems for fixed-wing military aircraft. VSI is jointly controlled and therefore is not consolidated in the Company's financial statements.
[3] | Opgal Optronics Industries Ltd. ("Opgal") is an Israeli company owned 50.1% by the Company and 49.9% by a subsidiary of Rafael. Opgal focuses mainly on commercial applications of thermal imaging and electro-optic technologies. The Company jointly controls Opgal with Rafael, and therefore Opgal is not consolidated in the Company's financial statements.
[4] | Netcity is a Romanian company held 40% by the Company. During 2011, the Company invested in Netcity approximately $8,100, in addition to $2,700 that were invested in 2010. Netcity is a constructor of fiber-telecommunication networks in Romania.

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -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 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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