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Financial Instruments and Risks Management - Credit Risk Internal Risk Rating (Details) - Trade accounts receivable - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Financial Instruments and Risks |  |  |
Expected credit losses | R$ 41,996 | R$ 37,179 | R$ 38,740
Credit risk |  |  |
Financial Instruments and Risks |  |  |
Credit risk exposure, internal rating | 3,077,813 | 2,574,237 |
Expected credit losses | 41,996 | 37,179 |
Credit risk | Low Risk | Current |  |  |
Financial Instruments and Risks |  |  |
Credit risk exposure, internal rating | 2,775,364 | 2,447,184 |
Credit risk | Average Risk | From 31 to 90 days |  |  |
Financial Instruments and Risks |  |  |
Credit risk exposure, internal rating | 168,836 | 66,587 |
Credit risk | High Risk | More than 90 days |  |  |
Financial Instruments and Risks |  |  |
Credit risk exposure, internal rating | R$ 133,613 | R$ 60,466 |

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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- Definition The amount of credit exposure that has not been rated by external rating agencies. [Refer: Credit exposure] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph IG24 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_IG24_c&doctype=Implementation%20Guidance&book=b -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 36 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_36_c&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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