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Property, Plant and Equipment, Net
 3 Months Ended
Mar. 31, 2020
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 March 31,
 
At December 31,
(in thousands)
2020
 
2019
 
2019
Land
$
27,964

 
$
29,251

 
$
28,092

Buildings and site improvements
193,971

 
196,848

 
195,210

Leasehold improvements
4,832

 
4,831

 
4,911

Machinery, equipment, and software
354,931

 
335,906

 
351,379

 
581,698

 
566,836

 
579,592

Less accumulated depreciation and amortization
(351,776
)
 
(326,181
)
 
(346,594
)
 
229,922

 
240,655

 
232,998

Capital projects in progress
17,019

 
10,743

 
16,014

 
$
246,941

 
$
251,398

 
$
249,012