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Property, Plant and Equipment, Net
 3 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net
 
Property, plant and equipment, net, at the dates indicated consisted of the following: 
 At June 30,At December 31,
(in thousands)
202120202020
Land
$28,373 $28,068 $28,553 
Buildings and site improvements
202,573 200,205 203,421 
Leasehold improvements
5,961 5,817 7,091 
Machinery, equipment, and software
392,860 359,997 372,923 
 629,767 594,087 611,988 
Less accumulated depreciation and amortization
(393,653)(360,719)(377,460)
 236,114 233,368 234,528 
Capital projects in progress
19,239 13,751 20,656 
Total$255,353 $247,119 $255,184