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Patents and other intangible assets
 12 Months Ended
Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]  
Patents and other intangible assets
5. 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   
  

 

 

    

 

 

  

 

Amortization expense for intangible assets is estimated to be approximately $2.1 million, $1.8 million, $1.7 million, $1.4 million, $0.5 million and $1.5 million for the periods ending December 31, 2014, 2015, 2016, 2017, 2018 and 2019 and thereafter, respectively.