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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASURMENTS (Tables) | 12 Months Ended
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Dec. 31, 2017
FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS [Abstract] |
Schedule of Recurring Fair Value Measurements | Recurring Fair Value Measurements Using the Indicated Inputs:
|  | December 31, 2017 |  |  | Quoted prices in active market for identical liability (Level 1) |  |  | Significant other observable inputs (Level 2) |  |  | Significant unobservable inputs (Level 3) |
Cross currency swap- asset position |  | $ | 16,455 |  |  | $ | -- |  |  | $ | 16,455 |  |  | $ | -- |
Marketable securities held for sale |  |  | 113,168 |  |  |  | 113,168 |  |  |  | -- |  |  |  | -- |
Foreign exchange forward and cylinders - liability position |  |  | (169 | ) |  |  | -- |  |  |  | (169 | ) |  |  | -- |
Foreign exchange forward and cylinders - asset position |  |  | 24 |  |  |  | -- |  |  |  | 24 |  |  |  | -- |
|  | $ | 129,478 |  |  | $ | 113,168 |  |  | $ | 16,310 |  |  | $ | -- |
|  | December 31, 2016 |  |  | Quoted prices in active market for identical liability (Level 1) |  |  | Significant other observable inputs (Level 2) |  |  | Significant unobservable inputs (Level 3) |
Cross currency swap- liability position |  | $ | 67 |  |  | $ | -- |  |  | $ | 67 |  |  | $ | -- |
Foreign exchange forward and cylinders - liability position |  |  | 976 |  |  |  |  |  |  |  | 976 |  |  |  | -- |
|  | $ | 1,043 |  |  | $ | -- |  |  | $ | 1,043 |  |  | $ | -- |
Schedule of Liabilities Measured on a Recurring Basis Using Significant Unobservable Inputs | Liabilities measured on a recurring basis using significant unobservable inputs (Level 3):
|  | Tower’s Israeli Banks Loans (including current maturities) |  |  | Others |
As of January 1, 2016 - at fair value |  | $ | 74,955 |  |  | $ | -- |
principal repayment |  |  | (82,855 | ) |  |  | -- |
Total changes in fair value recognized in earnings |  |  | 7,900 |  |  |  | -- |
As of December 31, 2016 - at fair value |  | $ | -- |  |  | $ | -- |
Schedule of Marketable Securities | The following table summarizes amortized costs, gross unrealized gains and losses and estimated fair values of available-for-sale marketable securities as of December 31, 2017:
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Estimated fair value |
Corporate bonds |  | $ | 98,998 |  |  | $ | 25 |  |  | $ | (683 | ) |  | $ | 98,340 |
Non- U.S government bonds |  |  | 2,730 |  |  |  | -- |  |  |  | (19 | ) |  |  | 2,711 |
Municipal bonds |  |  | 11,950 |  |  |  | 15 |  |  |  | (96 | ) |  |  | 11,869 |
Certificate of deposits |  |  | 248 |  |  |  | -- |  |  |  | -- |  |  |  | 248 |
|  | $ | 113,926 |  |  | $ | 40 |  |  | $ | (798 | ) |  | $ | 113,168 |
Schedule of Maturities of Marketable Securities | The scheduled maturities of available-for-sale marketable securities as of December 31, 2017 were as follows:
|  | Amortized cost |  |  | Estimated fair value |
Due within one year |  | $ | 7,688 |  |  | $ | 7,679 |
Due after one year through five years |  |  | 106,238 |  |  |  | 105,489 |
|  | $ | 113,926 |  |  | $ | 113,168 |
Schedule of Investments with Continuous Unrealized Losses | Investments with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values as of December 31, 2017 were as indicated in the following tables:
|  | December 31, 2017 |
|  | Investment with continuous unrealized losses for less than 12 months |  |  | Investments with continuous unrealized losses for 12 months or greater |  |  | Total Investments with continuous unrealized losses |
|  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |  |  | Fair value |  |  | Unrealized losses |
Corporate debentures |  | $ | 89,133 |  |  | $ | (683 | ) |  | $ | -- |  |  | $ | -- |  |  | $ | 89,133 |  |  | $ | (683 | )
Non- U.S government bonds |  |  | 2,711 |  |  |  | (19 | ) |  |  | -- |  |  |  | -- |  |  |  | 2,711 |  |  |  | (19 | )
Municipal bonds |  |  | 8,837 |  |  |  | (96 | ) |  |  | -- |  |  |  | -- |  |  |  | 8,837 |  |  |  | (96 | )
Total |  | $ | 100,681 |  |  | $ | (798 | ) |  | $ | -- |  |  | $ | -- |  |  | $ | 100,681 |  |  | $ | (798 | )

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