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Income tax and deferred taxes (Details 1) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Statement [Line Items] |  |
Current tax liabilities, current | $ 22,643 | $ 17,874
1st Category income tax [Member] |  |
Statement [Line Items] |  |
Current tax liabilities, current | 14,736 | 7,863
Foreign company income tax [Member] |  |
Statement [Line Items] |  |
Current tax liabilities, current | 7,838 | 9,944
Article 21 single tax [Member] |  |
Statement [Line Items] |  |
Current tax liabilities, current | $ 69 | $ 67

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