Property, Plant and Equipment, Net (Tables)

9 Months Ended

Sep. 30, 2018

Property, Plant and Equipment [Abstract]

Schedule of property, plant and equipment

Property, plant and equipment, net, at the dates indicated consisted of the following: 

	At September 30,						At December 31,
(in thousands)	2018			2017			2017
Land	$	30,173		$	33,030		$	33,087
Buildings and site improvements	203,323			201,877			212,817
Leasehold improvements	4,694			5,911			4,684
Machinery, equipment, and software	323,091			289,970			300,334
	561,281			530,788			550,922
Less accumulated depreciation and amortization	(316,768		)	(297,321		)	(299,907		)
	244,513			233,467			251,015
Capital projects in progress	13,166			31,711			22,005
	$	257,679		$	265,178		$	273,020