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5. Risk Management (Details 1) - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
SummaryOfBorrowingsLineItems [Line Items] |  |  |
Borrowings |  | R$ 8,713,260 | R$ 8,690,984
TR |  |  |
SummaryOfBorrowingsLineItems [Line Items] |  |  |
Borrowings | [1] | 1,574,564 | 1,535,030
CDI |  |  |
SummaryOfBorrowingsLineItems [Line Items] |  |  |
Borrowings | [2] | 1,144,391 | 1,082,228
TJLP |  |  |
SummaryOfBorrowingsLineItems [Line Items] |  |  |
Borrowings | [3] | 1,354,987 | 1,326,631
IPCA |  |  |
SummaryOfBorrowingsLineItems [Line Items] |  |  |
Borrowings | [4] | 1,699,747 | 1,697,452
LIBOR |  |  |
SummaryOfBorrowingsLineItems [Line Items] |  |  |
Borrowings | [5] | 2,814,399 | 2,906,999
Interest and charges |  |  |
SummaryOfBorrowingsLineItems [Line Items] |  |  |
Borrowings |  | R$ 125,172 | R$ 142,644
[1] | TR - Interest Benchmark Rate
[2] | CDI - (Certificado de Deposito Interbancario), an interbank deposit certificate
[3] | TJLP - (Taxa de Juros a Longo Prazo), a long-term interest rate index
[4] | IPCA - (Indice Nacional de Precos ao Consumidor Amplo), a consumer price index
[5] | LIBOR - London Interbank Offered Rate

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