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TAXES ON INCOME (Narrative) (Details) ₪ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 ILS (₪) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 | Dec. 31, 2014
Taxes On Income [Line Items] |  |  |  |  |
Period of tax exemption | 2 years | 2 years |  |  |
Period in which investment must be made | 3 years | 3 years |  |  |
Minimum qualifying investment | ₪ |  | ₪ 300 |  |  |
Experation period since approval | 14 years | 14 years |  |  |
Experation period since enterpise began operating | 12 years | 12 years |  |  |
Experation period since beginning of the year of election | 10 years | 10 years |  |  |
Foreign investors'' company tax benefits period | 12 years | 12 years |  |  |
Effective corporate income tax rate | 24.00% | 24.00% | 25.00% | 26.50% | 26.50%
Valuation allowance | $ 107,148 |  | $ 110,371 |  |
Net operating losses | 192,378 |  |  |  |
Israeli capital loss | 7,538 |  |  |  |
Accrued interest and penalties | 917 |  |  |  |
Decreases in tax positions for prior years | $ 3,880 |  | $ 4,362 |  |
Tax Year 2018 [Member] |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |
Effective corporate income tax rate | 23.00% | 23.00% |  |  |
Minimum [Member] |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |
Foreign investors' company tax benefits pecent | 10.00% | 10.00% |  |  |
Maximum [Member] |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |
Foreign investors' company tax benefits pecent | 25.00% | 25.00% |  |  |
First Two Years [Member] | Minimum [Member] |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |
Foreign investors' company tax benefits pecent | 10.00% | 10.00% |  |  |
First Two Years [Member] | Maximum [Member] |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |
Foreign investors' company tax benefits pecent | 25.00% | 25.00% |  |  |
Preferred enterprise [Member] |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |
Amended tax rate 2013 and 2014 | 16.00% | 16.00% |  |  |
Amended tax rate 2014 and thereafter | 20.00% |  |  |  |
Preferred enterprise [Member] | Development Area [Member] |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |
Amended tax rate 2014 and thereafter | 9.00% |  |  |  |
Preferred Technological Enterprise income [Member] |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |
Tax rate reduction percent | 12.00% | 12.00% |  |  |
Law For Encouragement Of Industry Taxes [Member] |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |
Industrial company defined as a company resident in Israel based on minimum percentage of income derived from an industrial enterprise owned by it | 20.00% |  |  |  |
Amortization period for deferred stock issuance costs | 3 years | 3 years |  |  |
Norway [Member] |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |
Net operating losses | $ 18,885 |  |  |  |
Brazil [Member] |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |
Net operating losses | $ 70,442 |  |  |  |
Annual limit against taxable income | 30.00% |  |  |  |
Domestic Country [Member] | Minimum [Member] |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |
Effective corporate income tax rate | 21.00% | 21.00% |  |  |
Domestic Country [Member] | Maximum [Member] |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |
Effective corporate income tax rate | 35.00% | 35.00% |  |  |
Slovakia [Member] |  |  |  |  |
Taxes On Income [Line Items] |  |  |  |  |
Decreases in tax positions for prior years | $ 1,156 |  |  |  |

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