Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment

Schedule of property, plant and equipment

	December 31
	2016		2015
Land and improvements	$	37,479	$	32,522
Mineral rights		11,240		—
Buildings		90,385		67,841
Machinery, equipment and customer capital		494,722		458,975
Computer hardware and software		43,631		41,850
Furniture and vehicles		10,893		10,534
Construction-in-progress		30,525		32,141
		718,875		643,863
Less accumulated depreciation		(352,433)		(332,844)
Property, plant and equipment, net	$	366,442	$	311,019