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LONG-TERM LOANS FROM BANKS (Schedule of Long-Term Debt form Banks) (Details) (Long-term loans from banks [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Outstanding principal $ 193,802us-gaap_DebtInstrumentCarryingAmount $ 161,109us-gaap_DebtInstrumentCarryingAmount
Fair value adjustments (24,026)tsem_LongTermDebtFairValueAdjustments (22,370)tsem_LongTermDebtFairValueAdjustments
Total long-term loans from banks 169,776tsem_LongTermDebtFairValueTotal 138,739tsem_LongTermDebtFairValueTotal
Current maturities (10,000)tsem_LongTermDebtFairValueCurrent (30,000)tsem_LongTermDebtFairValueCurrent
Fair value 159,776us-gaap_LongTermDebtFairValue 108,739us-gaap_LongTermDebtFairValue
U.S. Dollars [Member]
   
Debt Instrument [Line Items]    
Outstanding principal 120,155us-gaap_DebtInstrumentCarryingAmount
/ tsem_BankLoansCurrencyAxis
= tsem_UnitedStatesDollarsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
150,155us-gaap_DebtInstrumentCarryingAmount
/ tsem_BankLoansCurrencyAxis
= tsem_UnitedStatesDollarsMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
JPY [Member]
   
Debt Instrument [Line Items]    
Outstanding principal $ 73,647us-gaap_DebtInstrumentCarryingAmount
/ tsem_BankLoansCurrencyAxis
= tsem_JapaneseYenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
$ 10,954us-gaap_DebtInstrumentCarryingAmount
/ tsem_BankLoansCurrencyAxis
= tsem_JapaneseYenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember