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Property, Plant and Equipment
 3 Months Ended
Apr. 01, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
 
Property, plant and equipment are as follows (in thousands):
 
 
 
April 1,
2017
 
December 31,
2016
Land and land improvements
 
$
8,537

 
$
8,537

Buildings and building improvements
 
82,998

 
82,440

Machinery and equipment
 
547,660

 
546,425

Furniture and fixtures
 
9,591

 
9,553

Construction in progress
 
14,607

 
10,885

 
 
663,393

 
657,840

Accumulated depreciation
 
(457,497
)
 
(450,161
)
 
 
$
205,896

 
$
207,679