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TAXES ON INCOME (Narrative) (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 USD ($) | Dec. 31, 2017 USD ($) Integer | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Taxes on Income [Line Items] |  |  |  |
Tax rate |  | 24.00% | 25.00% | 26.50%
Effective tax rate |  | (10.50%) | 14.80% | 18.00%
Income tax expense | $ 19,200 | $ (13,631) | $ 21,412 | $ 30,832
Income taxes paid | $ 32,000 | 33,029 | 28,396 | $ 53,646
Tax loss carry-forwards |  | 335,360 |  |
Tax loss carry-forwards that have no expiration date |  | $ 69,053 |  |
Operating loss carry-forwards expiration date |  | Dec. 31, 2037 |  |
Accrued interest related to income tax uncertainties |  | $ 1,262 | $ 206 |
Deferred tax benefit |  | $ 31,000 |  |
New Federal corporate tax rate for periods beginning on or after January 1, 2018 |  | 21.00% |  |
Minimum [Member] | Other Income Tax Authority [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Year subject to audit |  | 2012 |  |
Maximum [Member] | Other Income Tax Authority [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Year subject to audit |  | 2016 |  |
Tax Year 2010 [Member] | Israel Tax Authority [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Settlement of tax year under examination |  | 2011 |  |
Earliest Tax Year [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Operating loss carry-forwards expiration date |  | Dec. 31, 2018 |  |
Latest Tax Year [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Operating loss carry-forwards expiration date |  | Dec. 31, 2037 |  |
Tax Year 2013 [Member] | Israel Tax Authority [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Year under examination |  | 2013 |  |
Settlement of tax year under examination |  | 2016 |  |
Tax Year 2015 [Member] | Israel Tax Authority [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Year under examination |  | 2015 |  |
United Kingdom [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Tax rate |  | 19.00% |  |
United States [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Tax rate |  | 39.00% |  |
United States [Member] | Minimum [Member] | U.S. Federal [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Year subject to audit |  | 2014 |  |
United States [Member] | U.S. Federal [Member] | Maximum [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Year subject to audit |  | 2015 |  |
Encouragement of Industry [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Number of annual installments for dedcution of public offering expenses | Integer |  | 3 |  |
Amortization period of purchased know-how and patents |  | 8 years |  |
Non-Israeli Subsidiaries [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Undistributed earnings |  | $ 349,888 |  |
Unrecognized deferred tax liability |  | $ 64,144 |  |
From 2015 through 2016 [Member] | The election [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Tax rate |  | 16.00% |  |
2017 and thereafter [Member] | The election [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Tax rate |  | 12.00% |  |
2017 [Member] | Income not eligible for Preferred Enterprise benefits [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Tax rate |  |  | 24.00% |
2018 and thereafter [Member] | Income not eligible for Preferred Enterprise benefits [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Tax rate |  | 23.00% |  |
2012 [Member] |  |  |  |
Taxes on Income [Line Items] |  |  |  |
Tax rate |  | 20.00% |  |

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