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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories
  September 30, December 31,
  2020 2019
  U.S. $ in thousands
Finished goods $72,373  $87,967 
Work-in-process  2,838   3,106 
Raw materials  77,474   77,431 
 152,685  168,504