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INVENTORY
9 Months Ended
Sep. 30, 2018
INVENTORY [Abstract]  
INVENTORY
8.
INVENTORY

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

  
September 30,
2018
  
December 31,
2017
 
       
Raw materials
 
$
89,830
  
$
87,683
 
Finished goods
  
199,461
   
165,771
 
  
$
289,291
  
$
253,454
 

The total inventory balance as of September 30, 2018 includes $23.3 million of inventory held by the companies acquired in the first quarter of 2018 (see Note 15 - Acquisitions).