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CONSOLIDATED BALANCE SHEETS (Parenthetical) - ₪ / shares
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Common stock, par value ₪ 0.3333 ₪ 0.3333
Common stock, shares authorized 60,000,000 60,000,000
Common stock, shares issued 23,475,431 23,475,431
Common stock, shares outstanding 23,475,431 23,475,431
Treasury stock, shares 2,507,314 2,507,314