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Income tax and deferred taxes (Details 6) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income tax and deferred taxes [Abstract]    
Deferred tax assets and liabilities, net opening balance $ 175,361 $ (205,283)
Increase (decrease) in deferred taxes in profit or loss (5,758) (27,407)
Increase (decrease) in deferred taxes in equity 2,292 2,515
Deferred tax liability (asset) at end of period $ (183,411) $ 175,361