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DERIVATIVE INSTRUMENTS (Schedule Of Derivative Instruments) (Statement of Operations) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain recognized in Statements of Comprehensive Gain | $ 303 |  |
Gain (loss) recognized in consolidated statements of operations | (766) | $ (191) | $ 815
Foreign Exchange Option And Forward Contract [Member] | Derivatives designated as hedging instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain recognized in Statements of Comprehensive Gain | 303 |  |
Foreign Exchange Option And Forward Contract [Member] | Derivatives designated as hedging instruments [Member] | Operating Expense [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) recognized in consolidated statements of operations | 1,772 | 261 | 110
Foreign exchange forward contracts [Member] | Derivatives not designated as hedging instruments [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain recognized in Statements of Comprehensive Gain |  |  |
Foreign exchange forward contracts [Member] | Derivatives not designated as hedging instruments [Member] | Financial Expense [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) recognized in consolidated statements of operations | $ (2,538) | $ (452) | $ 705

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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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