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Patents and other intangible assets | 12 Months Ended
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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.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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