Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Summary of Property, Plant and Equipment

Property, plant and equipment consist of the following as of December 31 (in thousands):

	2016			2015
Building and improvements	$	47,859		$	47,209
Machinery and equipment		223,450			210,880
Furniture and fixtures		2,710			2,221
Forklifts and tractors		10,167			7,607
Computer equipment		10,481			9,575
Construction in process		4,172			11,032
Land		11,417			8,532
Total property, plant and equipment		310,256			297,056
Accumulated depreciation		(206,970	)		(196,132	)
Total property, plant and equipment, net	$	103,286		$	100,924