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FINANCIAL INSTRUMENTS - Fair value of financial instruments (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
FINANCIAL INSTRUMENTS    
Financial assets R$ 1,750,841 R$ 1,886,067
Financial liabilities 17,339,894 18,925,008
Loans and Financing    
FINANCIAL INSTRUMENTS    
Financial liabilities 13,367,841 16,461,656
Financial liabilities, at fair value 13,533,306 17,102,512
Debentures    
FINANCIAL INSTRUMENTS    
Financial liabilities 1,538,873 47,928
Financial liabilities, at fair value 1,538,873 47,928
Unrealized losses on financial instruments    
FINANCIAL INSTRUMENTS    
Financial liabilities 5,245 1,267
Financial liabilities, at fair value 5,245 1,267
Obligation with FIDC    
FINANCIAL INSTRUMENTS    
Financial liabilities 938,526 1,135,077
Financial liabilities, at fair value 938,526 1,135,077
Other current liabilities    
FINANCIAL INSTRUMENTS    
Financial liabilities 988,967 625,410
Financial liabilities, at fair value 988,967 625,410
Other non-current liabilities    
FINANCIAL INSTRUMENTS    
Financial liabilities 499,092 653,670
Financial liabilities, at fair value 499,092 653,670
Short-term investments    
FINANCIAL INSTRUMENTS    
Financial assets 459,470 821,518
Financial assets, at fair value 459,470 821,518
Related parties    
FINANCIAL INSTRUMENTS    
Financial assets 27,939 51,839
Financial assets, at fair value 27,939 51,839
Financial liabilities 1,350  
Unrealized gains on financial instruments    
FINANCIAL INSTRUMENTS    
Financial assets 33,417  
Financial assets, at fair value 33,417  
Other current assets    
FINANCIAL INSTRUMENTS    
Financial assets 780,423 469,737
Financial assets, at fair value 780,423 469,737
Other non-current assets    
FINANCIAL INSTRUMENTS    
Financial assets 449,592 542,973
Financial assets, at fair value R$ 449,592 R$ 542,973