Property, Plant and Equipment, Net (Tables)

6 Months Ended

Jun. 30, 2016

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 June 30,						At December 31,
(in thousands)	2016			2015			2015
Land	$	30,165		$	29,097		$	28,698
Buildings and site improvements	172,279			173,070			171,890
Leasehold improvements	5,667			5,616			5,560
Machinery, equipment, and software	240,564			228,813			232,560
	448,675			436,596			438,708
Less accumulated depreciation and amortization	(268,096		)	(252,479		)	(257,115		)
	180,579			184,117			181,593
Capital projects in progress	38,812			22,720			32,123
	$	219,391		$	206,837		$	213,716