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5. Risk Management (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SummaryOfRiskManagementLineItems [Line Items]        
Cash and cash equivalents R$ 2,283,047 R$ 1,886,221 R$ 1,639,214 R$ 1,722,991
AA+(bra)        
SummaryOfRiskManagementLineItems [Line Items]        
Cash and cash equivalents 2,222,001 1,850,220    
AAA(bra)        
SummaryOfRiskManagementLineItems [Line Items]        
Cash and cash equivalents 43,978 35,452    
Other        
SummaryOfRiskManagementLineItems [Line Items]        
Cash and cash equivalents [1] R$ 17,068 R$ 549    
[1] This category includes current accounts and investment funds in banks whose balances were not significant.