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Other Intangible Assets | 12 Months Ended
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Dec. 31, 2017
Other Intangible Assets [Abstract] |
Other Intangible Assets | 6. Other 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 |
|  | 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
Amortization of finite-life intangible assets totaled $8.6 million, $8.4 million and $8.1 million for the years ended December 31, 2015, 2016 and 2017, respectively. In the year ended December 31, 2015, the Company wrote-off approximately $12.0 million of fully amortized intangible assets. 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 |
Indefinite life intangible assets are not amortized, rather they are subject to annual impairment tests. Annual impairment tests were completed resulting in no impairment charges for any of the periods shown. Finite life intangibles are amortized over their useful lives unless circumstances occur that cause the Company to revise such lives or review such assets for impairment.

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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 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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