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Inventories
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories

Note 4. Inventories

Inventories consisted of the following:

June 30, December 31,
      2019       2018
U.S. $ in thousands
Finished goods $      73,852 $        61,391
Work-in-process 3,600 2,616
Raw materials 70,347 59,517
147,799 123,524