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Property, Plant and Equipment, Net
 9 Months Ended
Sep. 30, 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 September 30,
 
At December 31,
(in thousands)
2019
 
2018
 
2018
Land
$
29,132

 
$
30,173

 
$
30,034

Buildings and site improvements
197,075

 
203,323

 
198,809

Leasehold improvements
4,909

 
4,694

 
4,826

Machinery, equipment, and software
345,861

 
323,091

 
330,076

 
576,977

 
561,281

 
563,745

Less accumulated depreciation and amortization
(339,920
)
 
(316,768
)
 
(318,388
)
 
237,057

 
244,513

 
245,357

Capital projects in progress
13,893

 
13,166

 
9,240

 
$
250,950

 
$
257,679

 
$
254,597