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Inventories
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventories

Note 5. Inventories

Inventories consisted of the following:

      December 31,       December 31,
2018 2017
(U.S. $ in thousands)
Finished goods $     61,391 $     63,234
Work-in-process 2,616 2,271
Raw materials   59,517   50,212
$ 123,524 $ 115,717