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32. Operating Costs and Expenses (Details 2) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfPersonnelAndManagementExpenseLineItems [Line Items]      
Personnel and management R$ 1,357,785 R$ 1,343,344 R$ 1,304,418
Personnel      
DisclosureOfPersonnelAndManagementExpenseLineItems [Line Items]      
Personnel and management 1,330,417 1,314,468 1,278,397
Personnel | Wages and salaries      
DisclosureOfPersonnelAndManagementExpenseLineItems [Line Items]      
Personnel and management 794,966 806,119 801,789
Personnel | Social charges on payroll      
DisclosureOfPersonnelAndManagementExpenseLineItems [Line Items]      
Personnel and management 261,459 266,183 257,519
Personnel | Meal assistance and education allowance      
DisclosureOfPersonnelAndManagementExpenseLineItems [Line Items]      
Personnel and management 113,177 119,881 109,999
Personnel | Provisons for profit sharing      
DisclosureOfPersonnelAndManagementExpenseLineItems [Line Items]      
Personnel and management 91,526 68,817 64,814
Personnel | Compensation - Voluntary termination Program/retirement      
DisclosureOfPersonnelAndManagementExpenseLineItems [Line Items]      
Personnel and management 69,289 53,468 44,276
Management      
DisclosureOfPersonnelAndManagementExpenseLineItems [Line Items]      
Personnel and management 27,368 28,876 26,021
Management | Wages and salaries      
DisclosureOfPersonnelAndManagementExpenseLineItems [Line Items]      
Personnel and management 21,422 22,895 20,639
Management | Social charges on payroll      
DisclosureOfPersonnelAndManagementExpenseLineItems [Line Items]      
Personnel and management 5,695 5,635 5,136
Management | Other expenses      
DisclosureOfPersonnelAndManagementExpenseLineItems [Line Items]      
Personnel and management R$ 251 R$ 346 R$ 246