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Patents and other intangible assets (Tables)
12 Months Ended
Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]  
Schedule of Patents and Other Intangible Assets

 

 

 

December 31,

 

(U.S. Dollars in thousands)

 

2014

 

 

2013

 

Cost

 

 

 

 

 

 

 

 

Patents

 

$

35,420

 

 

$

34,820

 

Trademarks—finite lived

 

 

596

 

 

 

620

 

License and other

 

 

7,248

 

 

 

7,748

 

 

 

 

43,264

 

 

 

43,188

 

Accumulated amortization

 

 

 

 

 

 

 

 

Patents

 

 

(33,319

)

 

 

(31,739

)

Trademarks—finite lived

 

 

(469

)

 

 

(454

)

License and other

 

 

(2,324

)

 

 

(1,949

)

 

 

 

(36,112

)

 

 

(34,142

)

Patents and other intangible assets, net

 

$

7,152

 

 

$

9,046