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Property, Plant and Equipment, Net (Tables)
3 Months Ended
Mar. 31, 2017
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
Property, plant and equipment, net, at the dates indicated consisted of the following: 
 
At March 31,
 
At December 31,
(in thousands)
2017
 
2016
 
2016
Land
$
32,370

 
$
30,535

 
$
32,127

Buildings and site improvements
186,974

 
173,605

 
183,882

Leasehold improvements
5,515

 
5,616

 
5,550

Machinery, equipment, and software
254,405

 
239,264

 
248,861

 
479,264

 
449,020

 
470,420

Less accumulated depreciation and amortization
(279,607
)
 
(264,398
)
 
(273,302
)
 
199,657

 
184,622

 
197,118

Capital projects in progress
50,808

 
32,038

 
35,692

 
$
250,465

 
$
216,660

 
$
232,810