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CONSOLIDATED BALANCE SHEETS (Parenthetical) - ₪ / shares
shares in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Ordinary shares, par value ₪ 15 ₪ 15
Ordinary shares, authorized 150,000 150,000
Ordinary shares, issued 98,544 93,071
Ordinary shares, outstanding 98,458 92,985
Treasury stock, shares 86 86