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.