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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Schedule of Property Plant and Equipment
     December 31,  

(U.S. Dollars in thousands)

    2013      2012  
     (Restated)      (Restated)  

Cost

      

Buildings

    $ 4,075       $ 3,911   

Plant, equipment and instrumentation

      133,427         121,370   

Furniture and fixtures

      5,872         5,567   
  

 

 

     

 

 

  
  143,374      130,848   

Accumulated depreciation

   (89,002 )    (78,055 ) 
  

 

 

     

 

 

  
$ 54,372    $ 52,793