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Financial instruments (Details 7) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financial instruments [Line Items]    
Net Variation Of Hedging $ (16,725)  
Gains (losses) on hedging instrument, fair value hedges (18,707) $ 16
Hedging Reserve In Equity Before Tax 1,982  
Debt Hedging [Member]    
Financial instruments [Line Items]    
Net Variation Of Hedging (14,960)  
Gains (losses) on hedging instrument, fair value hedges (15,942)  
Hedging Reserve In Equity Before Tax 982  
Investment Hedging [Member]    
Financial instruments [Line Items]    
Net Variation Of Hedging (1,765)  
Gains (losses) on hedging instrument, fair value hedges (2,765)  
Hedging Reserve In Equity Before Tax 1,000  
Assets Hedging [Member]    
Financial instruments [Line Items]    
Net Variation Of Hedging (10,383)  
Gains (losses) on hedging instrument, fair value hedges (11,492)  
Hedging Reserve In Equity Before Tax 1,109  
Liabilities Hedging [Member]    
Financial instruments [Line Items]    
Net Variation Of Hedging (6,342)  
Gains (losses) on hedging instrument, fair value hedges (7,215)  
Hedging Reserve In Equity Before Tax $ 873