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INFORMATION ON GEOGRAPHIC AREAS AND MAJOR CUSTOMERS (Schedule of Accounts Receivable of Major Customers) (Details) - Accounts Receivable [Member]
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Customer A [Member]    
Concentration Risk [Line Items]    
Percentage 13.00% 23.00%
Customer B [Member]    
Concentration Risk [Line Items]    
Percentage 9.00% 15.00%