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Property, Plant and Equipment (Tables)
9 Months Ended
Sep. 23, 2012
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
Property, Plant and Equipment
(Dollars in thousands)
 
 
 
 
September 23, 2012
 
December 25, 2011
Land and buildings
$
70,302

 
$
67,500

Machinery and equipment
405,422

 
390,304

Leasehold improvements and others
8,383

 
8,274

Construction in progress
7,932

 
8,908

 
492,039

 
474,986

Accumulated depreciation
(344,942
)
 
(329,239
)
Property, plant and equipment, net
$
147,097

 
$
145,747