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Income tax and deferred taxes (Details 7) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current income tax expense      
Current income tax expense $ (97,374) $ (116,483) $ (207,959)
Adjustments to prior year current income tax (1,901) 12,222 1,577
Current income tax expense, net, total (99,275) (104,261) (206,382)
Deferred tax expense      
Deferred tax expense (income) relating to the creation and reversal of temporary differences 26,219 2,551 26,434
Tax adjustments related to the creation and reversal of temporary differences from the previous year 2,877 8,309 973
Deferred tax expense, net, total 29,096 (5,758) 27,407
Tax expense (benefit) $ (70,179) $ (110,019) $ (178,975)