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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, plant and equipment consisted of the following:
 
 
December 31,
 (in thousands)
2018
 
2017
Land
$
30,034

 
$
33,087

Buildings and site improvements
198,809

 
212,817

Leasehold improvements
4,826

 
4,684

Machinery and equipment
330,076

 
300,334

 
563,745

 
550,922

Less accumulated depreciation and amortization
(318,388
)
 
(299,907
)
 
245,357

 
251,015

Capital projects in progress
9,240

 
22,005

 
$
254,597

 
$
273,020