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Taxes On Income (Schedule Of The Qualifying Percentage Of The Value Of The Productive Assets) (Details)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Up to NIS 140 [Member]
Dec. 31, 2012
NIS 140 - NIS 500 [Member]
Dec. 31, 2012
More than NIS 500 [Member]
Dec. 31, 2012
Minimum [Member]
NIS 140 - NIS 500 [Member]
ILS
Dec. 31, 2012
Minimum [Member]
More than NIS 500 [Member]
ILS
Dec. 31, 2012
Maximum [Member]
Up to NIS 140 [Member]
USD ($)
Dec. 31, 2012
Maximum [Member]
NIS 140 - NIS 500 [Member]
ILS
Taxes On Income [Line Items]              
Value of productive assets before the expansion       140 500 $ 140 500
New proportion that the required investment bears to the value of productive assets 12.00% 7.00% 5.00%