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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment

Property, plant and equipment as of December 31 were as follows (in thousands):

 

     2014      2013  

Land

   $ 2,089      $ 2,089  

Buildings and improvements

     43,800        43,083  

Machinery and equipment

     228,663        224,481  

Furniture and fixtures

     5,905        6,047  

Construction in-progress and deposits

     2,568        1,327  
  

 

 

    

 

 

 
  283,025     277,027  

Accumulated depreciation and amortization

  (245,638   (236,935
  

 

 

    

 

 

 

Net balance

$ 37,387   $ 40,092