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Property, Plant and Equipment, Net
 3 Months Ended
Mar. 31, 2019
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)
2019
 
2018
 
2018
Land
$
29,251

 
$
33,234

 
$
30,034

Buildings and site improvements
196,848

 
214,074

 
198,809

Leasehold improvements
4,831

 
4,767

 
4,826

Machinery, equipment, and software
335,906

 
318,201

 
330,076

 
566,836

 
570,276

 
563,745

Less accumulated depreciation and amortization
(326,181
)
 
(309,198
)
 
(318,388
)
 
240,655

 
261,078

 
245,357

Capital projects in progress
10,743

 
15,036

 
9,240

 
$
251,398

 
$
276,114

 
$
254,597