Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2017

Property, Plant and Equipment [Abstract]

Summary of Property, Plant and Equipment

Property, plant and equipment is comprised of the following:

	As of
	March 31,			December 31,
	2018			2017
Land	$	1,137		$	1,130
Buildings and improvements	64,457			64,201
Machinery and equipment	229,041			223,650
Less: Accumulated depreciation	(203,950		)	(200,734		)
Property, plant and equipment, net	$	90,685		$	88,247
Depreciation expense for the three months ended March 31, 2018				$	3,763
Depreciation expense for the three months ended March 31, 2017				$	3,172