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Income tax and deferred taxes (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]    
Current tax liabilities, current $ 17,874 $ 47,412
1st Category income tax [Member]    
Statement [Line Items]    
Current tax liabilities, current 7,863 25,163
Foreign company income tax [Member]    
Statement [Line Items]    
Current tax liabilities, current 9,944 21,097
Article 21 single tax [Member]    
Statement [Line Items]    
Current tax liabilities, current $ 67 $ 1,152