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Property, Plant and Equipment, net (Tables)
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
Property, plant and equipment consisted of the following:
 
 
December 31,
 (in thousands)
2016
 
2015
Land
$
32,127

 
$
28,698

Buildings and site improvements
183,882

 
171,890

Leasehold improvements
5,550

 
5,560

Machinery and equipment
248,861

 
232,560

 
470,420

 
438,708

Less accumulated depreciation and amortization
(273,302
)
 
(257,115
)
 
197,118

 
181,593

Capital projects in progress
35,692

 
32,123

 
$
232,810

 
$
213,716