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SIGNIFICANT ACCOUNTING POLICIES (Schedule of Accumulated Other Comprehensive Income, Net) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance as of January 1, 2017 $ (7,848)    
Other comprehensive income before reclassifications 2,449    
Amounts reclassified from AOCI (1,772)    
Other comprehensive income 677 $ 768 $ (4,505)
Balance as of December 31, 2017 (7,171) (7,848)  
Unrealized Gains (Losses) on Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance as of January 1, 2017 (256)    
Other comprehensive income before reclassifications 2,331    
Amounts reclassified from AOCI (1,772)    
Other comprehensive income 559    
Balance as of December 31, 2017 303 (256)  
Foreign Currency Translation Adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance as of January 1, 2017 (7,592)    
Other comprehensive income before reclassifications 118    
Amounts reclassified from AOCI    
Other comprehensive income 118    
Balance as of December 31, 2017 $ (7,474) $ (7,592)