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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASURMENTS (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of swap in asset position $ 16,455  
Fair value of swap in short-term liabilities 1,550  
Fair value of swap in long-term asset 18,005  
Fair value of swap in liability position (short term)   $ 67
Effective portion of unrealized gains recorded in OCI 2,758 202
Effect of hedge on operations 11,654 915
Amount of loss expected to be reclassified into earnings currently recorded as other comprehensive income, as a result of the maturity of currently held forward exchange contracts 1,500  
Long term bank deposit amount 12,500 12,500
Tower US Holdings [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value liability face amount 48,000  
Fair value of derivative liabilities 169  
TPSCo [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value liability face amount   36,000
Fair value of derivative liabilities   682
Tower and Jazz Debentures [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of debentures 345,000 245,000
Carrying amount 182,000 163,000
Fair value liability face amount 18,000 96,000
Fair value of derivative liabilities   $ 294
Fair value of derivative assets $ 24