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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 27, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment are as follows (in thousands):
 
 
 
2014
 
2013
Land and land improvements
 
$
13,982

 
$
14,507

Buildings and building improvements
 
101,407

 
97,674

Machinery and equipment
 
623,619

 
635,638

Furniture and fixtures
 
10,086

 
11,049

Construction in progress
 
13,154

 
11,828

 
 
762,248

 
770,696

Accumulated depreciation
 
(479,840
)
 
(465,789
)
 
 
$
282,408

 
$
304,907