Property, Plant and Equipment

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

6) Property, Plant and Equipment

	Estimated		December 31,
	Useful Life		2016		2015
Land and buildings		15-40 years		96,173		97,322
Machinery and equipment		3-12 years		464,291		432,841
Construction in process				21,045		16,049
				581,509		546,212
Less—accumulated depreciation				258,556		227,244
Property, plant and equipment, net			$	322,953	$	318,968

During the year ended December 31, 2015, we acquired $59.1 million in property, plant and equipment with the two acquisitions completed during 2015.

For the years ended December 31, 2016, 2015, and 2014, depreciation expense was $36.0 million, $ 31.5 million and $20.8 million, respectively.