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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |
Percentage |  | 100.00% | 100.00% | 100.00%
USA [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage |  | 52.00% | 49.00% | 44.00%
Japan [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage |  | 32.00% | 36.00% | 41.00%
Asia [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage | [1] | 12.00% | 12.00% | 11.00%
Europe [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Percentage | [1] | 4.00% | 3.00% | 4.00%
[1] | Represents revenues from individual countries of less than 10% each.

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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