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Goodwill And Other Intangible Assets, Net (Schedule Of Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Balance, at January 1, $ 486,046 [1]  
Adjustment in respect of previous acquisitions 994 [2] 3,000
Net translation differences (725) [3]  
Balance, at December 31, 499,326 486,046 [1]
Elite [Member]
    
Goodwill acquired during the year 5,384  
C4 Security [Member]
    
Goodwill acquired during the year $ 7,627  
[1] Including an adjustment of approximately $3000 related to a 2010 acquisition.
[2] In 2011, the Company adjusted provisions related to an acquisition made during 2010.
[3] Foreign currency translation differences resulting from goodwill allocated to reporting units, whose functional currency has been determined to be other than the U.S. dollar.