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SIGNIFICANT ACCOUNTING POLICIES (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (46,824)	$ (24,205)
Other comprehensive income (loss) before reclassifications	19,496	(19,099)
Amounts reclassified from accumulated other comprehensive income	(5,586)	(3,520)
Net current-period other comprehensive income (loss)	13,910	(22,619)	$ (13,659)
Ending balance	(32,914)	(46,824)	(24,205)
Unrealized gains (losses) on marketable securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(216)	(1,930)
Other comprehensive income (loss) before reclassifications	(854)	5,102
Amounts reclassified from accumulated other comprehensive income		(3,388)
Net current-period other comprehensive income (loss)	(854)	1,714
Ending balance	(1,070)	(216)	(1,930)
Unrealized gains (losses) on cash flow hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(101)	(569)
Other comprehensive income (loss) before reclassifications	6,821	600
Amounts reclassified from accumulated other comprehensive income	(5,586)	(132)
Net current-period other comprehensive income (loss)	1,235	468
Ending balance	1,134	(101)	(569)
Foreign currency translation adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(46,507)	(21,706)
Other comprehensive income (loss) before reclassifications	13,529	(24,801)
Amounts reclassified from accumulated other comprehensive income
Net current-period other comprehensive income (loss)	13,529	(24,801)
Ending balance	$ (32,978)	$ (46,507)	$ (21,706)

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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