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Geographic areas and major customers (Sales By Geographic Region) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Sales attributable based on geographic location | [1] | $ 133,753 | $ 125,690 | $ 100,347
North America [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Sales attributable based on geographic location |  | 108,024 | 100,434 | 65,590
Europe [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Sales attributable based on geographic location |  | 21,038 | 20,156 | 24,208
Asia Pacific [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Sales attributable based on geographic location |  | $ 4,691 | $ 5,100 | $ 10,549
[1] | Including sales to related parties in the amount of US$ 762 thousand, US$ 1,275 thousand and US$ 1,063 thousand in 2016, 2017 and 2018, respectively.

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