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DERIVATIVE INSTRUMENTS (Tables)
 12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule Of Derivative Instruments
   
Loss recognized in Statements of comprehensive income
  
Statement
of Operations
 item
  
Gain (loss) recognized
in consolidated statements of
 operations
  
   
December 31,
    
Year ended
December 31,
  
   
2018
    
2016
    
2017
    
2018
  
                           
Derivatives designated as hedging instruments:
                          
Foreign exchange option and forward contract
   $
(584
)
Operating expenses
  
$
261
    
$
1,772
    
$
(1,373
)
                                   
Derivatives not designated as hedging instruments:
                                  
Foreign exchange forward contracts
    
-
  
Financial expenses
    
(452
)
    
(2,538
)
    
1,172
  
                                   
Total
   $
(584
)
    
$
(191
)
  
$
(766
)
  
$
(201
)
                               
 
      
December 31,
  
 
Balance sheet
  
2017
    
2018
  
           
Derivatives designated as hedging instruments:
Foreign exchange forward contracts
"Other account receivables and prepaid expenses"
  
$
303
    
$
3
  
 
"Other account payables and accrued expenses"
  
$
-
    
$
(587
)
 
"Other comprehensive income (loss)"
  
$
303
    
$
(584
)
                   
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts and other derivatives
"Other receivables and prepaid expenses"
  
$
148
    
$
2
  
   
 "Other account payables and accrued expenses"
    
$
(457
 )    
$
(446
 )