The amortization period of certain tax benefits including purchased know-how and patents.

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The number of annual installments for dedcution of public offerng expenses.

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Years subject to audit by income tax authorities, in CCYY format.

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Settlement of tax year being audited in the income tax examination, in CCYY format.

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New Federal corporate tax rate for periods beginning on or after January 1, 2018.

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Operating loss carryforwards have no expiration date

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of other deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. For example, but not limited to, acquisition-date income tax benefits or expenses recognized from changes in the acquirer's valuation allowance for its previously existing deferred tax assets resulting from a business combination and adjustments to beginning-of-year balance of a valuation allowance because of a change in circumstance causing a change in judgment about the realizability of the related deferred tax asset in future periods.

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Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Tax year being audited in the income tax examination, in CCYY format.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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TAXES ON INCOME (Narrative) (Details) $ in Thousands	1 Months Ended	12 Months Ended
TAXES ON INCOME (Narrative) (Details) $ in Thousands	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%