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LONG-TERM INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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LONG-TERM INVESTMENTS [Abstract] |  |
Severance pay funds (see Note 15) | $ 10,214 tsem_SeverancePayFund | $ 12,522 tsem_SeverancePayFund
Others | 1,682 us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent | 1,972 us-gaap_AvailableForSaleSecuritiesEquitySecuritiesNoncurrent
Long-term investments, total | $ 11,896 us-gaap_LongTermInvestments | $ 14,494 us-gaap_LongTermInvestments

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- Definition Fund for the liability for severance pay benefits for severance and pension, funded by regular employer deposits and compay maintained insurance policies. + References No definition available. + Details
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- Definition Equity securities categorized neither as held-to-maturity nor trading which are intended be sold more than one year from the balance sheet date or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
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- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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