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EMPLOYEE RELATED LIABILITIES (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Severance pay fund, Israeli employees | $ 10,711 |  |
Long-term employee liabilties, Israeli employees | 12,258 |  |
Israeli employee termination benefits | $ 5,059 | $ 4,345 | $ 3,986
Reduction to plan obiligation, USA employees |  | 3,900 |
TPSCo [Member] |  |  |
Matching contribution (as a percent) | 10.00% |  |
Employee contribution (as a percent) | 1.00% |  |
Cost recognized | $ 6,706 | $ 7,015 | $ 6,823

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- Definition Severance pay fund related to Israeli employees. + References No definition available. + Details
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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase in benefit obligation for benefits provided to employees payable from defined benefit plan or payable upon retirement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Details
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