Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Property, Plant and Equipment

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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment

Note 6. Property, Plant and Equipment

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

December 31, December 31,
      2017       2016
(U.S. $ in thousands)
Machinery and equipment $        133,656 $        128,187
Buildings and improvements 131,993 121,970
Computer equipment and software 48,237 48,917
Office equipment, furniture and fixtures 17,893 16,393
Land 19,234 19,591
351,013 335,058
Accumulated depreciation (155,147 ) (131,327 )
195,866 203,731
Construction work in progress 4,085 4,684
$ 199,951 $ 208,415

Depreciation expenses were $31.6 million, $33.8 million and $33.4 million in the years ended December 31, 2017, 2016 and 2015, respectively.