Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

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):

	2018			2017
Building and improvements	$	50,240		$	49,403
Machinery and equipment		233,464			228,107
Furniture and fixtures		1,625			1,620
Forklifts and tractors		10,872			9,799
Computer equipment		10,142			9,680
Construction in process		16,392			5,954
Land		11,417			11,417
Total property, plant and equipment		334,152			315,980
Accumulated depreciation		(217,008	)		(212,870	)
Total property, plant and equipment, net	$	117,144		$	103,110