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

Property, plant and equipment consist of the following as of December 31 (in thousands):

 

     2015      2014  

Building and improvements

   $ 47,209       $ 50,394   

Machinery and equipment

     210,880         203,496   

Furniture and fixtures

     2,221         2,237   

Forklifts and tractors

     7,607         6,052   

Computer equipment

     9,575         8,120   

Construction in process

     11,032         6,707   

Land

     8,532         8,858   
  

 

 

    

 

 

 

Total property, plant and equipment

     297,056         285,864   

Accumulated depreciation

     (196,132      (187,148
  

 

 

    

 

 

 

Total property, plant and equipment, net

   $ 100,924       $ 98,716