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INVENTORY
6 Months Ended
Jun. 30, 2018
INVENTORY [Abstract]  
INVENTORY
8. INVENTORY

Inventories consist of the following (U.S. dollars in thousands):

  
June 30,
2018
  
December 31,
2017
 
       
Raw materials 
 
$
99,984
  
$
87,683
 
Finished goods 
  
183,746
   
165,771
 
  
$
283,730
  
$
253,454
 

The total inventory balance as of June 30, 2018 includes $23.1 million of inventory held by the companies acquired in the first quarter of 2018 (see Note 15 - Acquisitions).