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Property, Plant and Equipment (Tables)
3 Months Ended
Mar. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
Property, Plant and Equipment
(Dollars in thousands)
 
 
 
 
March 31, 2013
 
December 30, 2012
Land and buildings
$
73,114

 
$
70,235

Machinery and equipment
422,568

 
408,620

Leasehold improvements and others
8,435

 
8,374

Construction in progress
10,336

 
7,565

 
514,453

 
494,794

Accumulated depreciation
(361,197
)
 
(347,250
)
Property, plant and equipment, net
$
153,256

 
$
147,544