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23. Salaries and social security taxes payable (Details) - ARS ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
SummaryOfSalariesAndSocialSecurityTaxesPayableLineItems [Line Items]    
Noncurrent $ 162,737 $ 176,679
Current 1,742,626 1,801,492
Early retirements payable    
SummaryOfSalariesAndSocialSecurityTaxesPayableLineItems [Line Items]    
Noncurrent 14,884 4,960
Current 10,248 7,099
Seniority-based bonus    
SummaryOfSalariesAndSocialSecurityTaxesPayableLineItems [Line Items]    
Noncurrent 147,853 171,719
Salaries payable and provisions    
SummaryOfSalariesAndSocialSecurityTaxesPayableLineItems [Line Items]    
Current 1,581,241 1,571,228
Social security payable    
SummaryOfSalariesAndSocialSecurityTaxesPayableLineItems [Line Items]    
Current $ 151,137 $ 223,165