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Income tax and deferred taxes (Details 9) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current income tax expense by foreign and domestic parties, net      
Current income tax expense $ (206,382) $ (166,613) $ (147,589)
Deferred tax expense by foreign and domestic parties, net      
Deferred tax expense 27,407 440 14,624
Tax expense using the effective rate (178,975) (166,173) (132,965)
Foreign countries [member]      
Current income tax expense by foreign and domestic parties, net      
Current income tax expense (7,516) (14,396) (10,844)
Deferred tax expense by foreign and domestic parties, net      
Deferred tax expense (1,885) (154) 626
Country of domicile [member]      
Current income tax expense by foreign and domestic parties, net      
Current income tax expense (198,866) (152,217) (136,745)
Deferred tax expense by foreign and domestic parties, net      
Deferred tax expense $ 29,292 $ 594 $ 13,998