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Property, Plant and Equipment, Net
 3 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net
 
Property, plant and equipment consisted of the following:
 At March 31,At December 31,
(in thousands)202220212021
Land
$34,591 $28,280 $28,175 
Buildings and site improvements
197,180 201,283 202,393 
Leasehold improvements
6,153 7,023 5,995 
Machinery, equipment, and software
407,808 385,195 399,079 
 645,732 621,781 635,642 
Less accumulated depreciation and amortization
(406,835)(382,907)(402,246)
 238,897 238,874 233,396 
Capital projects in progress
26,778 16,810 26,473 
Total$265,675 $255,684 $259,869