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Financial Instruments and Risks - Derivatives Outstanding Long and Short Positions (Details) R$ in Thousands, $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2018 BRL (R$) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 BRL (R$)
--- | --- | --- | --- | ---
Financial Instruments and Risks |  |  |  |
Fair value |  | R$ (1,142,766) |  | R$ 6,014
Debt hedge |  |  |  |
Financial Instruments and Risks |  |  |  |
Fair value |  | (1,023,848) |  | (22,679)
Cash flow hedge |  |  |  |
Financial Instruments and Risks |  |  |  |
Fair value |  | (118,918) |  | 28,693
Cash flow hedge | Swap CDI vs. Fixed (US$) |  |  |  |
Financial Instruments and Risks |  |  |  |
Notional amount | $ |  |  | $ 50,000 |
Fair value |  |  |  | (2,485)
Cash flow hedge | Zero-cost collar (R$ vs. US$) |  |  |  |
Financial Instruments and Risks |  |  |  |
Notional amount | $ | $ 3,040,000 |  | 1,485,000 |
Fair value |  | (134,814) |  | 25,822
Cash flow hedge | Fixed Swap (US$) vs. CDI |  |  |  |
Financial Instruments and Risks |  |  |  |
Notional amount | $ |  |  | 50,000 |
Fair value |  |  |  | 5,356
Cash flow hedge | NDF (R$ vs. US$) |  |  |  |
Financial Instruments and Risks |  |  |  |
Notional amount | $ | 150,000 |  |  |
Fair value |  | 17,036 |  |
Cash flow hedge | Swap bunker |  |  |  |
Financial Instruments and Risks |  |  |  |
Notional amount | $ | 5,344 |  |  |
Fair value |  | (1,140) |  |
Assets | Debt hedge |  |  |  |
Financial Instruments and Risks |  |  |  |
Fair value |  | 119,178 |  | 88,042
Assets | Debt hedge | Swap CDI vs. Fixed (US$) |  |  |  |
Financial Instruments and Risks |  |  |  |
Notional amount |  | 8,722,620 |  | 950,000
Fair value |  | 119,178 |  | 22,525
Assets | Debt hedge | Swap Libor vs. Fixed (US$) |  |  |  |
Financial Instruments and Risks |  |  |  |
Notional amount | $ | 2,757,143 |  | 19,841 |
Fair value |  |  |  | 65,517
Liabilities | Debt hedge |  |  |  |
Financial Instruments and Risks |  |  |  |
Fair value |  | (1,143,026) |  | (110,721)
Liabilities | Debt hedge | Swap CDI vs. Fixed (US$) |  |  |  |
Financial Instruments and Risks |  |  |  |
Notional amount | $ | 2,402,110 |  | 291,725 |
Fair value |  | (972,319) |  | (44,087)
Liabilities | Debt hedge | Swap Libor vs. Fixed (US$) |  |  |  |
Financial Instruments and Risks |  |  |  |
Notional amount | $ | $ 2,757,143 |  | $ 19,841 |
Fair value |  | R$ (170,707) |  | R$ (66,634)

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