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Financial Instruments and Risks - Derivative Fair Value Net by Maturity Date (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | R$ (1,142,766) | R$ 6,014
Current period |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net |  | 53,270
Less than one year |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (244,069) |
Later than one year and not later than two years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (180,333) | (16,064)
Later than two years and not later than three years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | 87,851 | R$ (31,192)
Later than three years and not later than four years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | 83,692 |
Later than four years and not later than five years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | 80,052 |
Later than five years and not later than six years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | 82,963 |
Later than six years and not later than seven years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | (486,958) |
Later than seven years and not later than eight years |  |
Financial Instruments and Risks |  |
Derivative fair value asset (liability), net | R$ (565,964) |

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