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