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INFORMATION ON GEOGRAPHIC AREAS AND MAJOR CUSTOMERS (Schedule of Revenues by Geographic Area) (Details) - Geographic Concentration [Member] - Revenue [Member]
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Percentage 100.00% 100.00% 100.00%
USA [Member]      
Segment Reporting Information [Line Items]      
Percentage 52.00% 52.00% 49.00%
Japan [Member]      
Segment Reporting Information [Line Items]      
Percentage 34.00% 32.00% 36.00%
Asia [Member]      
Segment Reporting Information [Line Items]      
Percentage [1] 10.00% 12.00% 12.00%
Europe [Member]      
Segment Reporting Information [Line Items]      
Percentage 4.00% 4.00% 3.00%
[1] Represents revenues from individual countries of less than 10% each.