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LONG-TERM LOANS FROM BANKS (Facility Agreement) (Narrative) (Details) (Facility Agreement [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Debt Instrument [Line Items]  
Outstanding principal $ 101,000us-gaap_DebtInstrumentCarryingAmount
Letters of credit outstanding amount 3,300us-gaap_LettersOfCreditOutstandingAmount
Number of installment payments 6tsem_DebtInstrumentPeriodicPaymentsNumber
LIBOR [Member]
 
Debt Instrument [Line Items]  
Basis spread over variable interest rate 3.90%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= tsem_FacilityAgreementMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
2015 [Member] | Israeli Banks [Member]
 
Debt Instrument [Line Items]  
Installment payment 10,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= tsem_FacilityAgreementMember
/ tsem_DebtInstrumentRepaymentScheduleAxis
= tsem_PeriodicPaymentOneMember
/ dei_LegalEntityAxis
= tsem_IsraeliBanksMember
2016 [Member] | Israeli Banks [Member]
 
Debt Instrument [Line Items]  
Installment payment 14,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= tsem_FacilityAgreementMember
/ tsem_DebtInstrumentRepaymentScheduleAxis
= tsem_PeriodicPaymentTwoMember
/ dei_LegalEntityAxis
= tsem_IsraeliBanksMember
2017 [Member] | Israeli Banks [Member]
 
Debt Instrument [Line Items]  
Installment payment 56,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= tsem_FacilityAgreementMember
/ tsem_DebtInstrumentRepaymentScheduleAxis
= tsem_PeriodicPaymentThreeMember
/ dei_LegalEntityAxis
= tsem_IsraeliBanksMember
2018 [Member] | Israeli Banks [Member]
 
Debt Instrument [Line Items]  
Installment payment $ 21,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= tsem_FacilityAgreementMember
/ tsem_DebtInstrumentRepaymentScheduleAxis
= tsem_PeriodicPaymentFourMember
/ dei_LegalEntityAxis
= tsem_IsraeliBanksMember