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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 |

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