Property, Plant and Equipment, Net (Tables)

9 Months Ended

Sep. 30, 2017

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)	2017			2016			2016
Land	$	33,030		$	30,217		$	32,127
Buildings and site improvements	201,877			176,430			183,882
Leasehold improvements	5,911			5,682			5,550
Machinery, equipment, and software	289,970			249,227			248,861
	530,788			461,556			470,420
Less accumulated depreciation and amortization	(297,321		)	(275,096		)	(273,302		)
	233,467			186,460			197,118
Capital projects in progress	31,711			43,210			35,692
	$	265,178		$	229,670		$	232,810