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DERIVATIVE INSTRUMENTS (Tables)
 12 Months Ended
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule Of Derivative Instruments

     
Gain recognized in Statements of Comprehensive Gain
       
Gain (loss) recognized
in consolidated
statements of
operations
  
     
Statement
    
   
December 31,
  
of
Operations
  
Year ended
December 31,
  
   
2017
  
 item
  
2015
    
2016
    
2017
  
                           
Derivatives designated as hedging instruments:
                          
Foreign exchange option and forward contract
    
303
  
Operating expenses
  
$
110
    
$
261
      
1,772
  
                                   
Derivatives not designated as hedging instruments:
                                  
Foreign exchange forward contracts
    
-
  
Financial expenses
    
705
      
(452
)
    
(2,538
)
                                   
Total
    
303
      
$
815
    
$
(191
)
  
$
(766
)
 
        
December 31,
  
    Balance sheet   2016     2017  
                 
Derivatives designated as hedging instruments:
Foreign exchange forward contracts
  
"Other account receivables and prepaid expenses"
  
$
21
    
$
303
  
 
"Other account payables and accrued expenses"
  
$
(277
)
  
$
-
  
 
"Other comprehensive income (loss)"
  
$
(256
)
  
$
303
  
                     
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts and other derivatives
  
"Other receivables and prepaid expenses"
  
$
176
    
$
148
  
 
"Other account payables and accrued expenses"
  
$
(79
)
  
$
(457
)