Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

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):

	2019			2018
Machinery and equipment	$	248,633		$	233,464
Building and improvements		51,547			50,240
Forklifts and tractors		10,870			10,872
Computer equipment		10,647			10,142
Furniture and fixtures		1,441			1,625
Construction in process		59,257			16,392
Land		11,417			11,417
Total property, plant and equipment		393,812			334,152
Accumulated depreciation		(222,512	)		(217,008	)
Total property, plant and equipment, net	$	171,300		$	117,144