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Property, Plant and Equipment (Tables)
 6 Months Ended
Jul. 01, 2017
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment are as follows (in thousands):
 
 
 
July 1,
2017
 
December 31,
2016
Land and land improvements
 
$
8,080

 
$
8,537

Buildings and building improvements
 
79,293

 
82,440

Machinery and equipment
 
535,009

 
546,425

Furniture and fixtures
 
9,026

 
9,553

Construction in progress
 
15,767

 
10,885

 
 
647,175

 
657,840

Accumulated depreciation
 
(448,248
)
 
(450,161
)
 
 
$
198,927

 
$
207,679