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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2013
Property, plant and equipment  
Summary of property, plant and equipment

 

 

 
   December 31,  
 
   2013   2012  

Land

   $ 1,160   $ 960  

Land improvements

     1,849     1,768  

Buildings

     16,743     12,852  

Machinery and equipment

     25,756     24,286  

Furniture and fixtures

     8,772     7,465  

Mobile equipment and other

     1,267     1,138  

Construction-in-process

     1,113     351  
           
​ ​ ​ ​ ​ ​ ​ ​

Total property, plant and equipment

     56,660     48,820  

Less accumulated depreciation

     (31,794 )   (28,933 )
           
​ ​ ​ ​ ​ ​ ​ ​

Net property, plant and equipment

   $ 24,866   $ 19,887  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​