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Income tax and deferred taxes (Details 8) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current income tax expense by foreign and domestic parties, net      
Current income tax expense $ (99,275) $ (104,261) $ (206,382)
Deferred tax expense by foreign and domestic parties, net      
Deferred tax expense 29,096 (5,758) 27,407
Tax expense using the effective rate (70,179) (110,019) (178,975)
Foreign countries [member]      
Current income tax expense by foreign and domestic parties, net      
Current income tax expense (9,782) (7,394) (7,516)
Deferred tax expense by foreign and domestic parties, net      
Deferred tax expense 10,284 2,370 (1,885)
Country of domicile [member]      
Current income tax expense by foreign and domestic parties, net      
Current income tax expense (89,493) (96,867) (198,866)
Deferred tax expense by foreign and domestic parties, net      
Deferred tax expense $ 18,812 $ (8,128) $ 29,292