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10. Financial instruments (Details 4) - ARS ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
SummaryOfFinancialInstrumentsLineItems [Line Items]    
Trade receivables $ 7,587,906 $ 8,385,237
Group 1    
SummaryOfFinancialInstrumentsLineItems [Line Items]    
Trade receivables [1] 6,438,500 7,487,484
Group 2    
SummaryOfFinancialInstrumentsLineItems [Line Items]    
Trade receivables [2] 480,237 339,740
Group 3    
SummaryOfFinancialInstrumentsLineItems [Line Items]    
Trade receivables [3] $ 669,169 $ 558,013
[1] Relates to customers with debt to become due.
[2] Relates to customers with past due debt from 0 to 3 months.
[3] Relates to customers with past due debt from 3 to 12 months.