Property, Plant and Equipment, Net (Tables)

3 Months Ended

Mar. 31, 2021

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 March 31,				At December 31,
(in thousands)	2021		2020		2020
Land	$	28,280	$	27,964	$	28,553
Buildings and site improvements	201,283		193,971		203,421
Leasehold improvements	7,023		4,832		7,091
Machinery, equipment, and software	385,195		354,931		372,923
	621,781		581,698		611,988
Less accumulated depreciation and amortization	(382,907)		(351,776)		(377,460)
	238,874		229,922		234,528
Capital projects in progress	16,810		17,019		20,656
	$	255,684	$	246,941	$	255,184