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DERIVATIVE FINANCIAL INSTRUMENTS (Tables)
3 Months Ended
Mar. 31, 2018
DERIVATIVE FINANCIAL INSTRUMENTS [Abstract]  
Gains (Losses) Related to Derivative Instruments Not Designated as Hedging Instruments
The following table summarizes gains (losses) related to derivative instruments not designated as hedging instruments during the three-month periods ended March 31, 2018 and 2017 (U.S. dollars in thousands):
 
Location of
Gain (Loss)
Recognized in Income
 
Amount of Gain (Loss)
Recognized in Income
 
Derivatives not designated as
hedging instruments:
  
Three Months Ended
 
 
March 31,
 
 
2018
  
2017
 
         
Foreign currency contracts 
 
Other income (expense)
 
$
  
$
(485
)
Gains (Losses) Related to Derivative Instruments Designated as Cash Flow Hedges
The following table summarizes gains (losses) related to derivative instruments recorded in other comprehensive income (loss) during the three-month periods ended March 31, 2018 and 2017 (U.S. dollars in thousands):
 
  
Amount of Gain (Loss) Recognized
in Other Comprehensive Loss
 
  
Three Months Ended
 
  
March 31,
 
Derivatives designated as hedging instruments:
 
2018
  
2017
 
       
Foreign currency forward contracts related to intercompany
     license fee, product sales, and selling expense hedges
 
$
(247
)
 
$
(387
)
 
The following table summarizes gains (losses) relating to derivative instruments reclassified from accumulated other comprehensive loss into income during the three-month periods ended March 31, 2018 and 2017 (U.S. dollars in thousands):

Derivatives designated
as hedging instruments:
  
Location of
Gain (Loss) Reclassified
from Accumulated Other
Comprehensive Loss
into Income
    Amount of Gain (Loss) Reclassified
from Accumulated Other
Comprehensive Loss into Income
 
 
Three Months Ended
 
 
March 31,
 
 
2018
  
2017
 
         
Foreign currency forward contracts related to intercompany license fees and product sales hedges 
 
Revenue
 
$
(49
)
 
$
(25
)
           
Foreign currency forward contracts related to intercompany selling expense hedges
 
Selling expenses
 
$
  
$
(41
)