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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.

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_i&doctype=Standard -URIDate 2017-03-09 + Details
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