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Property, plant and equipment
12 Months Ended
Dec. 31, 2013
Property Plant And Equipment [Abstract]  
Property, plant and equipment

4. Property, plant and equipment

 

     December 31,  

(U.S. Dollars in thousands)

   2013     2012  
           (Restated)  

Cost

    

Buildings

   $ 4,075      $ 3,911   

Plant, equipment and instrumentation

     131,572        120,982   

Furniture and fixtures

     5,872        5,567   
  

 

 

   

 

 

 
     141,519        130,460   

Accumulated depreciation

     (86,913     (76,625
  

 

 

   

 

 

 
   $ 54,606      $ 53,835   
  

 

 

   

 

 

 

Depreciation expense for the years ended December 31, 2013, 2012 and 2011 was $20.0 million, $15.8 million and $14.3 million, respectively.