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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASURMENTS (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of swap in asset position |  | $ 4,951 | $ 16,455
Fair value of swap in short-term liabilities |  | 1,771 | 1,550
Fair value of swap in long-term asset |  | 6,722 | 18,005
Effective portion of unrealized gains recorded in OCI |  | 1,329 | 2,758
Gain (loss) of hedge on operations |  | (11,787) | 11,654
Long term bank deposit amount |  | 12,500 | 12,500
Marketable securities |  | 135,850 | 113,874
Short term deposit |  | 120,079 |
Subsequent Event [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
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 | $ 1,231 |  |
Tower US Holdings [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value liability face amount |  | 42,000 | 48,000
Fair value of derivative liabilities |  | 16 | 169
Tower and Jazz Debentures [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of debentures |  | 127,000 | 345,000
Carrying amount |  | 120,000 | 182,000
Fair value liability face amount |  | 92,000 | 18,000
Fair value of derivative assets |  | $ 379 | $ 24

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