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Patents and other intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Patents and Other Intangible Assets |
|  | December 31, |
(U.S. Dollars, in thousands) |  | 2012 |  |  | 2011 |
|  | (Restated) |  |  | (Restated) |
Cost |  |  |  |  |  |  |  |
Patents |  | $ | 38,905 |  |  | $ | 38,893 |
Trademarks—definite lived |  |  | 657 |  |  |  | 545 |
|  |  | 39,562 |  |  |  | 39,438 |
Accumulated amortization |  |  |  |  |  |  |  |
Patents |  |  | (31,845 | ) |  |  | (30,211 | )
Trademarks—definite lived |  |  | (427 | ) |  |  | (381 | )
|  |  | (32,272 | ) |  |  | (30,592 | )
Patents and other intangible assets, net |  | $ | 7,290 |  |  | $ | 8,846 |

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- Definition Tabular disclosure of finite lived and indefinite lived intangibles assets, in total and by major class, including the gross carrying amount and accumulated amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References No definition available. + Details
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- Details
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