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Property, Plant and Equipment
3 Months Ended
Mar. 27, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
Property, Plant and Equipment
(Dollars in thousands)
 
 
 
 
March 27, 2016
 
December 27, 2015
Land and buildings
$
73,011

 
$
73,803

Machinery and equipment
492,277

 
486,612

Leasehold improvements and others
4,464

 
4,204

Construction in progress
18,735

 
20,455

 
588,487

 
585,074

Accumulated depreciation
(358,081
)
 
(350,428
)
Property, plant and equipment, net
$
230,406

 
$
234,646



Depreciation expense was $8.6 million and $8.5 million for the thirteen weeks ended March 27, 2016 and March 29, 2015, respectively.