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Patents and other intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Patents and Other Intangible Assets |
|  | December 31, |
(U.S. Dollars, in thousands) |  | 2017 |  |  | 2016 |
Cost |  |  |  |  |  |  |  |
Patents |  | $ | 38,621 |  |  | $ | 38,348 |
License and other |  |  | 10,276 |  |  |  | 7,611 |
Trademarks—finite lived |  |  | 533 |  |  |  | 319 |
|  |  | 49,430 |  |  |  | 46,278 |
Accumulated amortization |  |  |  |  |  |  |  |
Patents |  |  | (34,151 | ) |  |  | (34,717 | )
License and other |  |  | (4,625 | ) |  |  | (3,962 | )
Trademarks—finite lived |  |  | (193 | ) |  |  | (138 | )
|  |  | (38,969 | ) |  |  | (38,817 | )
Patents and other intangible assets, net |  | $ | 10,461 |  |  | $ | 7,461 |
Schedule of Future Amortization Expense | Future amortization expense for intangible assets is estimated as follows:
(U.S. Dollars, in thousands) |  | Amortization |
2018 |  | $ | 2,352 |
2019 |  |  | 1,909 |
2020 |  |  | 1,366 |
2021 |  |  | 1,321 |
2022 |  |  | 1,314 |
Thereafter |  |  | 2,199 |
Total |  | $ | 10,461 |

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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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