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Income tax and deferred taxes (Details 2)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income tax and deferred taxes [Line Items]      
Applicable tax rate 27.00% 25.50% 24.00%
Spain [member]      
Income tax and deferred taxes [Line Items]      
Applicable tax rate 25.00% 25.00%  
Belgium [member]      
Income tax and deferred taxes [Line Items]      
Applicable tax rate 29.58% 33.99%  
Mexico [member]      
Income tax and deferred taxes [Line Items]      
Applicable tax rate 30.00% 30.00%  
United States [member] | Top of range [member]      
Income tax and deferred taxes [Line Items]      
Applicable tax rate 21.00% 34.00%  
United States [member] | Bottom of range [member]      
Income tax and deferred taxes [Line Items]      
Applicable tax rate 6.00% 6.00%  
South Africa [member]      
Income tax and deferred taxes [Line Items]      
Applicable tax rate 28.00% 28.00%