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, 2016
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,
2016       2015
(U.S. $ in thousands)
Machinery and equipment $         128,187 $         114,049
Buildings and improvements 121,970 104,818
Computer equipment and software 48,917 48,249
Office equipment, furniture and fixtures 16,393 16,400
Land 19,591 19,674
335,058 303,190
Accumulated depreciation (131,327 ) (111,348 )
203,731 191,842
Construction work in progress 4,684 10,092
$ 208,415 $ 201,934

Depreciation expenses were $33.8 million, $33.4 million and $26.2 million in the years ended December 31, 2016, 2015 and 2014, respectively.

During the year ended December 31, 2016, the Company recorded impairment charges of $7.0 million, related to certain of its property and equipment assets, of which $5.1 million were related to the Company’s software assets and were classified as selling, general and administrative expenses. The impairment charges were determined due to changes in management’s long-term plans regarding the expected utilization of these assets. During the year ended December 31, 2015, the Company recorded impairment charges of $10.5 million, related to certain of its facilities in the United States.