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Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Other Intangible Assets [Abstract] |
Indefinite Life Intangible Assets | Other intangible assets consist of the following (U.S. dollars in thousands):
|  | Carrying Amount at December 31, |
Indefinite life intangible assets: |  | 2016 |  |  | 2017 |
Trademarks and trade names |  | $ | 24,599 |  |  | $ | 24,599 |
Other indefinite lived intangibles |  |  | 3,763 |  |  |  | 3,763 |
|  | $ | 28,362 |  |  | $ | 28,362 |
Finite Life Intangible Assets |
|  | December 31, 2016 |  |  | December 31, 2017 |  |
Finite life intangible assets: |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  | Weighted-average Amortization Period
Scanner technology |  | $ | 46,482 |  |  | $ | 36,624 |  |  | $ | 46,482 |  |  | $ | 39,657 |  | 18 years
Developed technology |  |  | 22,500 |  |  |  | 18,383 |  |  |  | 22,500 |  |  |  | 19,207 |  | 20 years
Distributor network |  |  | 11,598 |  |  |  | 11,598 |  |  |  | 11,598 |  |  |  | 11,598 |  | 15 years
Trademarks |  |  | 2,592 |  |  |  | 1,011 |  |  |  | 2,785 |  |  |  | 1,197 |  | 15 years
Other |  |  | 46,219 |  |  |  | 26,584 |  |  |  | 57,550 |  |  |  | 29,971 |  | 8 years
|  | $ | 129,391 |  |  | $ | 94,200 |  |  | $ | 140,915 |  |  | $ | 101,630 |  | 15 years
Future Amortization Expense | The estimated annual amortization expense for each of the five succeeding fiscal years are as follows (U.S. dollars in thousands):
Year Ending December 31, |  |  |  |
| 2018 |  |  | $ | 8,978 |
| 2019 |  |  |  | 8,876 |
| 2020 |  |  |  | 4,898 |
| 2021 |  |  |  | 4,148 |
| 2022 |  |  |  | 5,201 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&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 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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