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Inventories
3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Inventories

Note 2. Inventories

Inventories, net consisted of the following:

      March 31,       December 31,
2017 2016
U.S. $ in thousands
Finished goods $      64,814 $      62,728
Work-in-process 2,337 2,389
Raw materials 48,867 52,404
$ 116,018 $ 117,521