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DERIVATIVE INSTRUMENTS (Schedule of Fair Value of Derivative Instruments) (Details) - Foreign Exchange [Member] - Forward Contracts [Member] - Other current assets (liabilities) [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Derivative [Line Items] |  |  |
Fair value of derivative instruments, assets | [1] | $ 170 |
Fair value of derivative instruments, liabilities | [1] |  | $ (102)
[1] | To protect against changes in value of forecasted foreign currency cash flows resulting from salaries and related payments that are denominated in NIS, the Company has entered into foreign currency forward contracts. These contracts are designated as cash flows hedges, as defined by ASC 815, as amended, and are considered highly effective as hedges of these expenses. The forward contracts are expected to occur at various dates within the following twelve months.

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- Definition Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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