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14. Loans, Debentures, and Finance Leases (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
SummaryOfLoansDebenturesAndFinanceLeasesLineItems [Line Items]    
Long term consolidated debt R$ 10,086,919 R$ 8,941,526
From 1 to 2 years    
SummaryOfLoansDebenturesAndFinanceLeasesLineItems [Line Items]    
Long term consolidated debt 1,826,907 3,203,383
From 2 to 3 years    
SummaryOfLoansDebenturesAndFinanceLeasesLineItems [Line Items]    
Long term consolidated debt 894,640 1,699,009
From 3 to 4 years    
SummaryOfLoansDebenturesAndFinanceLeasesLineItems [Line Items]    
Long term consolidated debt 1,302,450 693,993
From 4 to 5 years    
SummaryOfLoansDebenturesAndFinanceLeasesLineItems [Line Items]    
Long term consolidated debt 3,016,406 554,162
More than 5 years    
SummaryOfLoansDebenturesAndFinanceLeasesLineItems [Line Items]    
Long term consolidated debt R$ 3,046,516 R$ 2,790,979