Property, Plant and Equipment, Net

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

7. Property, Plant and Equipment, net

Property, plant and equipment consisted of the following at December 31:


(in thousands)	2015			2014
Land	$	14,950		$	14,950
Buildings		68,941			67,571
Machinery, equipment and fixtures		60,787			65,179
Construction in progress		9,099			9,746
Accumulated depreciation		(67,260	)		(61,432	)

Property, plant and equipment, net	$	86,517		$	96,014

Depreciation expense related to property, plant and equipment was $11.8 million, $9.9 million and $9.3 million for the years ended December 31, 2015, 2014 and 2013, respectively.

Included within machinery, equipment and fixtures are spare parts of approximately $2.4 million and $2.5 million as of December 31, 2015 and 2014, respectively. Spare parts include replacement parts relating to plant and equipment and are either recognized as an expense when consumed or re-classified and capitalized as part of the related plant and equipment and depreciated over a time period not exceeding the useful life of the related asset. During the years ended December 31, 2015 and 2014, $7.9 million and $1.7 million, respectively, of capitalized software development costs were placed into service and removed out of construction in progress.