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12. Trade receivables (Details 2) - ARS ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables $ 7,587,906 $ 8,385,237
Not due    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables 10,377 230,953
Past due    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables 1,149,406 897,752
Up to 3 months    
SummaryOfTradeReceivablesLineItems [Line Items]    
Trade receivables $ 6,428,123 $ 7,256,532