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Property, Plant and Equipment, Net
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net

Note 6. Property, Plant and Equipment, Net

Property, plant and equipment, net consisted of the following:

      December 31,       December 31,
2018 2017
(U.S. $ in thousands)
Machinery and equipment $           134,708 $          133,656
Buildings and improvements 139,666 131,993
Computer equipment and software 49,991 48,237
Office equipment, furniture and fixtures 17,616 17,893
Land   19,111     19,234  
361,092 351,013
Accumulated depreciation   (173,437 )   (155,147 )
187,655 195,866
Construction work in progress   495     4,085  
$ 188,150   $ 199,951  

Depreciation expenses were $28.9 million, $31.6 million and $33.8 million in the years ended December 31, 2018, 2017 and 2016, respectively.