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Property, Plant and Equipment, Net
 6 Months Ended
Jun. 30, 2017
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)
2017
 
2016
 
2016
Land
$
32,686

 
$
30,165

 
$
32,127

Buildings and site improvements
201,723

 
172,279

 
183,882

Leasehold improvements
5,605

 
5,667

 
5,550

Machinery, equipment, and software
272,072

 
240,564

 
248,861

 
512,086

 
448,675

 
470,420

Less accumulated depreciation and amortization
(288,287
)
 
(268,096
)
 
(273,302
)
 
223,799

 
180,579

 
197,118

Capital projects in progress
37,563

 
38,812

 
35,692

 
$
261,362

 
$
219,391

 
$
232,810