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Property, plant and equipment (Tables)
9 Months Ended
Sep. 30, 2015
Summary of Property, Plant and Equipment

Property, plant and equipment at September 30, 2015 and December 31, 2014 consists of the following:

 

     September 30,
2015
     December 31,
2014
 

Land

   $ 2,458       $ 2,458   

Buildings and improvements

     14,419         14,380   

Machinery and equipment

     109,223         107,899   

Office furniture, fixtures and equipment

     4,957         4,698   

Automotive equipment

     491         374   

Construction in progress

     6,551         3,432   
  

 

 

    

 

 

 
     138,099         133,241   

Less accumulated depreciation

     (89,639      (83,215
  

 

 

    

 

 

 
   $ 48,460       $ 50,026