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Financial Instruments and Risks - Fair Value Hierarchy (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Financial Instruments and Risks |  |  |
Assets | R$ 53,932,644 | R$ 28,526,195 | R$ 29,371,275
Liabilities | 41,906,709 | 16,909,584 | R$ 19,246,286
Fair value |  |  |
Financial Instruments and Risks |  |  |
Assets | 26,528,404 | 6,314,312 |
Liabilities | 1,636,700 | 127,896 |
Fair value | Derivative financial instruments |  |  |
Financial Instruments and Risks |  |  |
Liabilities | 1,636,700 | 127,896 |
Fair value | Financial investments |  |  |
Financial Instruments and Risks |  |  |
Assets | 21,098,565 | 1,631,505 |
Fair value | Derivative financial instruments |  |  |
Financial Instruments and Risks |  |  |
Assets | 493,934 | 133,910 |
Fair value | Biological assets |  |  |
Financial Instruments and Risks |  |  |
Assets | 4,935,905 | 4,548,897 |
Fair value | Level 1 |  |  |
Financial Instruments and Risks |  |  |
Assets | 14,933,513 |  |
Fair value | Level 1 | Financial investments |  |  |
Financial Instruments and Risks |  |  |
Assets | 14,933,513 |  |
Fair value | Level 2 |  |  |
Financial Instruments and Risks |  |  |
Assets | 6,658,986 | 1,765,415 |
Liabilities | 1,636,700 | 127,896 |
Fair value | Level 2 | Derivative financial instruments |  |  |
Financial Instruments and Risks |  |  |
Liabilities | 1,636,700 | 127,896 |
Fair value | Level 2 | Financial investments |  |  |
Financial Instruments and Risks |  |  |
Assets | 6,165,052 | 1,631,505 |
Fair value | Level 2 | Derivative financial instruments |  |  |
Financial Instruments and Risks |  |  |
Assets | 493,934 | 133,910 |
Fair value | Level 3 |  |  |
Financial Instruments and Risks |  |  |
Assets | 4,935,905 | 4,548,897 |
Fair value | Level 3 | Biological assets |  |  |
Financial Instruments and Risks |  |  |
Assets | R$ 4,935,905 | R$ 4,548,897 |

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