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Income tax and deferred taxes (Details 7) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current income tax expense      
Current income tax expense $ (116,483) $ (207,959) $ (182,567)
Adjustments to prior year current income tax 12,222 1,577 15,954
Current income tax expense, net, total (104,261) (206,382) (166,613)
Deferred tax expense      
Deferred tax expense (income) relating to the creation and reversal of temporary differences 2,551 26,434 440
Tax adjustments related to the creation and reversal of temporary differences from the previous year 8,309 973  
Deferred tax expense, net, total (5,758) 27,407 440
Tax expense (benefit) $ (110,019) $ (178,975) $ (166,173)