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Patents and other intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Patents and Other Intangible Assets |
|  | December 31, |
(U.S. Dollars, in thousands) |  | 2016 |  |  | 2015 |
Cost |  |  |  |  |  |  |  |
Patents |  | $ | 38,348 |  |  | $ | 36,847 |
License and other |  |  | 7,611 |  |  |  | 5,357 |
Trademarks—finite lived |  |  | 319 |  |  |  | 120 |
|  |  | 46,278 |  |  |  | 42,324 |
Accumulated amortization |  |  |  |  |  |  |  |
Patents |  |  | (34,717 | ) |  |  | (33,297 | )
License and other |  |  | (3,962 | ) |  |  | (3,605 | )
Trademarks—finite lived |  |  | (138 | ) |  |  | (120 | )
|  |  | (38,817 | ) |  |  | (37,022 | )
|  | $ | 7,461 |  |  | $ | 5,302 |
Schedule of Future Amortization Expense | Future amortization expense for intangible assets is estimated as follows:
(U.S. Dollars, in thousands) |  | Amortization |
2017 |  | $ | 1,524 |
2018 |  |  | 886 |
2019 |  |  | 736 |
2020 |  |  | 785 |
2021 |  |  | 743 |
Thereafter |  |  | 2,787 |
|  | $ | 7,461 |

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- Definition Schedule of finite and indefinite lived intangible assets future amortization expense. + References No definition available. + Details
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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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