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INCOME TAXES (Schedule of Deferred Tax Asset/Liability) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Net deferred tax benefit - current    
Net operating loss carryforwards $ 938us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 2,026us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Employees benefits and compensation 5,170us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 4,003us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Debt discount 1,253tsem_DeferredTaxAssetsTaxDeferredExpenseDebtDiscount   
Accruals, reserves and others 3,809us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 2,760us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Gross deferred tax benefit - current 11,170us-gaap_DeferredTaxAssetsGrossCurrent 8,789us-gaap_DeferredTaxAssetsGrossCurrent
Valuation allowance - current (3,354)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent (2,779)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Total net current deferred tax benefit 7,816us-gaap_DeferredTaxAssetsNetCurrent 6,010us-gaap_DeferredTaxAssetsNetCurrent
Net deferred tax benefit - long-term    
Net operating loss carryforwards 320,954tsem_DeferredTaxAssetsOperatingLossCarryforwardsNoncurrent 284,446tsem_DeferredTaxAssetsOperatingLossCarryforwardsNoncurrent
Employees benefits and compensation 2,663tsem_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsNoncurrent 4,605tsem_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsNoncurrent
Research and development 1,940us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment 2,005us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment
Others 1,237us-gaap_DeferredTaxAssetsOther 1,212us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets - long-term 326,794us-gaap_DeferredTaxAssetsGrossNoncurrent 292,268us-gaap_DeferredTaxAssetsGrossNoncurrent
Valuation allowance - long-term (293,670)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (255,899)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Total net long-term deferred tax assets 33,124us-gaap_DeferredTaxAssetsNetNoncurrent 36,369us-gaap_DeferredTaxAssetsNetNoncurrent
Depreciation and amortization (30,293)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (41,255)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred tax related to gain on acquisition (66,722)tsem_DeferredTaxLiabilityGainOnAcquisition   
Intangible assets (6,318)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (6,929)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Debt discount (4,200)us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts (884)us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts
Others (869)us-gaap_DeferredTaxLiabilitiesOther (912)us-gaap_DeferredTaxLiabilitiesOther
Total net long-term deferred tax liability $ (75,278)us-gaap_DeferredTaxLiabilitiesNoncurrent $ (13,611)us-gaap_DeferredTaxLiabilitiesNoncurrent