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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment

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

 

     2015      2014  

Land

   $ 2,089       $ 2,089   

Buildings and improvements

     44,647         43,800   

Machinery and equipment

     231,305         228,663   

Furniture and fixtures

     5,652         5,905   

Construction in-progress and deposits

     3,839         2,568   
  

 

 

    

 

 

 
     287,532         283,025   

Accumulated depreciation and amortization

     (250,082      (245,638
  

 

 

    

 

 

 

Net balance

   $ 37,450       $ 37,387