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Property, Plant and Equipment
9 Months Ended
Oct. 01, 2011
Property, Plant and Equipment [Abstract] 
Property, Plant and Equipment
2. Property, Plant and Equipment
                 
    October 1,     December 31,  
    2011     2010  
Land and buildings
  $ 19,096     $ 19,096  
Machinery and equipment
    27,894       24,780  
Office furniture and equipment
    1,168       1,168  
Construction in process
    1,561       1,139  
 
           
Property, plant and equipment, at cost
    49,719       46,183  
Less accumulated depreciation
    31,416       30,203  
 
           
Property, plant and equipment, net
  $ 18,303     $ 15,980