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CONSOLIDATED BALANCE SHEETS (Parenthetical) (ILS)
Dec. 31, 2011
Dec. 31, 2010
CONSOLIDATED BALANCE SHEETS [Abstract]    
Ordinary shares, par value per share 0.2 0.2
Ordinary shares, shares authorized 60,000,000 60,000,000
Ordinary shares, shares issued 41,182,011 40,697,831
Ordinary shares, shares outstanding 41,182,011 40,697,831