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Commitments And Contingent Liabilities (Narrative) (Details)	12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2011 Israeli Tax Authority [Member] 2002 Through 2006 [Member] ILS	Dec. 31, 2011 Israeli Tax Authority [Member] 2007 [Member] ILS
Restructuring Cost and Reserve [Line Items]
Rent expenses	$ 5,950,000	$ 6,193,000	$ 7,068,000
Additional taxes demanded by tax authority				1,561,000,000	197,000,000

X

- Definition

The estimated range of reasonably possible losses resulting from an adverse position taken by a taxing authority.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 14

-Paragraph 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (d)(3)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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X

- Definition

Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

+ References

No definition available.

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