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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2019
Summary of Significant Accounting Policies [Abstract]  
Inventories Inventories consist of the following (U.S. dollars in thousands):


 
June 30,
2019
   
December 31,
2018
 
             
Raw materials
 
$
92,768
   
$
91,610
 
Finished goods
   
199,928
     
204,211
 
Total Inventory, net
 
$
292,696
   
$
295,821