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Inventories (Tables)
3 Months Ended
Mar. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventories

Inventories consisted of the following:

March 31, December 31,
      2016       2015
U.S. $ in thousands
Finished goods $      77,105 $      78,604
Work-in-process 7,883 6,559
Raw materials 39,491 38,495
$ 124,479 $ 123,658