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Property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2017
Property Plant And Equipment [Abstract] |
Schedule of Useful Lives of Assets | The useful lives of these assets are as follows:
|  | Years
Buildings |  | 25 to 33
Plant and equipment |  | 1 to 10
Instrumentation |  | 3 to 4
Computer software |  | 3 to 7
Furniture and fixtures |  | 4 to 8
Schedule of Property Plant and Equipment | The assets and related accumulated depreciation are adjusted for property retirements and disposals, with the resulting gain or loss included in earnings. Fully depreciated assets remain in the accounts until retired from service.
|  | December 31, |
(U.S. Dollars, in thousands) |  | 2017 |  |  | 2016 |
Cost |  |  |  |  |  |  |  |
Buildings |  | $ | 3,725 |  |  | $ | 3,225 |
Plant and equipment |  |  | 47,588 |  |  |  | 43,745 |
Instrumentation |  |  | 75,818 |  |  |  | 71,962 |
Computer software |  |  | 48,604 |  |  |  | 44,720 |
Furniture and fixtures |  |  | 7,605 |  |  |  | 8,308 |
Construction in progress |  |  | 769 |  |  |  | 1,907 |
|  |  | 184,109 |  |  |  | 173,867 |
Accumulated depreciation |  |  | (138,970 | ) |  |  | (124,951 | )
Property, plant and equipment, net |  | $ | 45,139 |  |  | $ | 48,916 |

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