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Property, Plant and Equipment Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2012
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
(Dollars in thousands) 
 
2012

 
2011

Land and land improvements
$
16,448

 
$
16,076

Buildings and structures
32,908

 
32,418

Machinery and equipment
165,369

 
168,538

Construction in progress
3,188

 
1,367

 
217,913

 
218,399

Less: accumulated depreciation
(159,863
)
 
(156,946
)
Total property, plant and equipment
$
58,050

 
$
61,453