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Financial instruments (Details 11) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Financial instruments [Line Items] |  |
Total loans | $ 2,814,870 | $ 2,202,050
Bank borrowings [Member] |  |
Financial instruments [Line Items] |  |
Current loans | 82 | 199
Non-current loans | 69,376 | 69,138
Total loans | $ 69,458 | $ 69,337

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