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FINANCIAL INSTRUMENTS - Measurement of fair value (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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FINANCIAL INSTRUMENTS |  |
Total financial assets | R$ 4,834,178 | R$ 1,750,841
Total financial liabilities | 18,988,870 | 17,339,894
Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Total financial assets | 4,834,178 | 1,750,841
Total financial liabilities | 18,988,870 | 17,123,897
Short-term debts | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 1,544,211 | 1,822,183
Long-term debt | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities | 11,594,612 | 11,545,658
Debentures |  |
FINANCIAL INSTRUMENTS |  |
Total financial liabilities | 2,911,044 | 1,538,873
Debentures | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 18,015 | 2,755
Non-current financial liabilities | 2,893,029 | 1,536,118
Related parties |  |
FINANCIAL INSTRUMENTS |  |
Total financial liabilities |  | 1,350
Related parties | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities |  | 1,350
Obligation with FIDC |  |
FINANCIAL INSTRUMENTS |  |
Total financial liabilities | 1,018,501 | 938,526
Obligation with FIDC | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities | 1,018,501 | 938,526
Unrealized losses on financial instruments - Derivative instruments |  |
FINANCIAL INSTRUMENTS |  |
Total financial liabilities |  | 5,245
Unrealized losses on financial instruments - Derivative instruments | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities |  | 5,245
Lease liabilities |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 202,536 |
Non-current financial liabilities | 601,733 |
Other current liabilities |  |
FINANCIAL INSTRUMENTS |  |
Total financial liabilities | 666,858 | 988,967
Other current liabilities | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 666,858 | 772,970
Other non-current liabilities |  |
FINANCIAL INSTRUMENTS |  |
Total financial liabilities | 449,375 | 499,092
Other non-current liabilities | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities | 449,375 | 499,092
Short-term investments |  |
FINANCIAL INSTRUMENTS |  |
Total financial assets | 3,652,949 | 459,470
Short-term investments | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial assets | 3,652,949 | 459,470
Related parties |  |
FINANCIAL INSTRUMENTS |  |
Total financial assets | 95,445 | 27,939
Total financial liabilities |  | 1,350
Related parties | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial assets | 95,445 | 27,939
Unrealized gains on financial instruments - Derivative instruments |  |
FINANCIAL INSTRUMENTS |  |
Total financial assets | 2,846 | 33,417
Unrealized gains on financial instruments - Derivative instruments | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial assets | 2,846 | 30,711
Non-current financial assets |  | 2,706
Other current assets |  |
FINANCIAL INSTRUMENTS |  |
Total financial assets | 618,769 | 780,423
Other current assets | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial assets | 618,769 | 780,423
Other non-current assets |  |
FINANCIAL INSTRUMENTS |  |
Total financial assets | 464,169 | 449,592
Other non-current assets | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial assets | 464,169 | 449,592
Quoted Prices Active Markets for Identical Assets (Level 1) | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Total financial assets |  | 114,027
Quoted Prices Active Markets for Identical Assets (Level 1) | Short-term investments | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial assets |  | 114,027
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Total financial assets | 4,834,178 | 1,636,814
Total financial liabilities | 18,988,870 | 17,123,897
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Short-term debts | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 1,544,211 | 1,822,183
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Long-term debt | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities | 11,594,612 | 11,545,658
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Debentures | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 18,015 | 2,755
Non-current financial liabilities | 2,893,029 | 1,536,118
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Related parties | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities |  | 1,350
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Obligation with FIDC | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities | 1,018,501 | 938,526
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Unrealized losses on financial instruments - Derivative instruments | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities |  | 5,245
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Lease liabilities |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 202,536 |
Non-current financial liabilities | 601,733 |
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Other current liabilities | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 666,858 | 772,970
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Other non-current liabilities | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities | 449,375 | 499,092
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Short-term investments | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial assets | 3,652,949 | 345,443
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Related parties | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial assets | 95,445 | 27,939
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Unrealized gains on financial instruments - Derivative instruments | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial assets | 2,846 | 30,711
Non-current financial assets |  | 2,706
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Other current assets | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial assets | 618,769 | 780,423
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Other non-current assets | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial assets | R$ 464,169 | R$ 449,592

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