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Patents and other intangible assets (Tables)
12 Months Ended
Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]  
Schedule of Patents and Other Intangible Assets
   December 31,  

(U.S. Dollars in thousands)

   2013     2012  
           (Restated)  

Cost

    

Patents

   $ 42,568      $ 38,905   

Trademarks—definite lived

     620        657   
  

 

 

   

 

 

 
     43,188        39,562   

Accumulated amortization

    

Patents

     (33,688     (31,845

Trademarks—definite lived

     (454     (427
  

 

 

   

 

 

 
     (34,142     (32,272
  

 

 

   

 

 

 

Patents and other intangible assets, net

   $ 9,046      $ 7,290