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Financial Instruments and Risks - Credit Risk Internal Risk Rating (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financial Instruments and Risks |  |
Allowance for doubtful accounts | R$ 37,179 | R$ 38,740
Credit risk | Trade accounts receivable |  |
Financial Instruments and Risks |  |
Credit risk exposure, internal rating | 2,574,237 | 2,336,503
Credit risk | Trade accounts receivable | Low Risk | Not past due and delay up to 30 days |  |
Financial Instruments and Risks |  |
Credit risk exposure, internal rating | 2,447,184 | 2,262,628
Credit risk | Trade accounts receivable | Average Risk | Delay between 30 and 90 days |  |
Financial Instruments and Risks |  |
Credit risk exposure, internal rating | 66,587 | 21,016
Credit risk | Trade accounts receivable | High Risk | Delay over than 90 days and renegotiated with the client or with security interest |  |
Financial Instruments and Risks |  |
Credit risk exposure, internal rating | R$ 60,466 | R$ 52,859

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