SIGNIFICANT ACCOUNTING POLICIES (Schedule of Reclassification of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Beginning Balance	$ (286)	$ (389)
Other comprehensive income before reclassifications, net	(3,092)	5,521
Amounts reclassified from accumulated other comprehensive income	1,687	(5,418)
Net current period other comprehensive loss	(1,405)	103	$ (141)
Total accumulated other comprehensive loss	(1,691)	(286)	(389)
Unrealized losses on marketable securities [Member]
Beginning Balance	(291)
Other comprehensive income before reclassifications, net	(24)	(291)
Amounts reclassified from accumulated other comprehensive income
Net current period other comprehensive loss	(24)	(291)
Total accumulated other comprehensive loss	(315)	(291)
Unrealized gain (losses) on cash flow hedges [Member]
Beginning Balance	5	(389)
Other comprehensive income before reclassifications, net	(3,068)	5,812
Amounts reclassified from accumulated other comprehensive income	1,687	(5,418)
Net current period other comprehensive loss	(1,381)	394
Total accumulated other comprehensive loss	$ (1,376)	$ 5	$ (389)

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.

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