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FINANCIAL INSTRUMENTS - Fair value of financial instruments (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
FINANCIAL INSTRUMENTS    
Financial assets R$ 9,291,006 R$ 12,712,924
Financial liabilities 22,104,962 25,257,075
Trade accounts payable    
FINANCIAL INSTRUMENTS    
Financial liabilities 3,179,954 2,743,818
Financial liabilities, at fair value 3,179,954 2,743,818
Loans and Financing    
FINANCIAL INSTRUMENTS    
Financial liabilities 16,461,656 20,417,810
Financial liabilities, at fair value 17,102,512 20,716,266
Debentures    
FINANCIAL INSTRUMENTS    
Financial liabilities 47,928 165,423
Financial liabilities, at fair value 47,928 165,423
Unrealized losses on financial instruments    
FINANCIAL INSTRUMENTS    
Financial liabilities 1,267 6,584
Financial liabilities, at fair value 1,267 6,584
FIDC Obligation    
FINANCIAL INSTRUMENTS    
Financial liabilities 1,135,077 1,007,259
Financial liabilities, at fair value 1,135,077 1,007,259
Other current liabilities    
FINANCIAL INSTRUMENTS    
Financial liabilities 625,410 514,599
Financial liabilities, at fair value 625,410 514,599
Other non-current liabilities    
FINANCIAL INSTRUMENTS    
Financial liabilities 653,670 401,582
Financial liabilities, at fair value 653,670 401,582
Cash and cash equivalents    
FINANCIAL INSTRUMENTS    
Financial assets 2,555,338 5,063,383
Financial assets, at fair value 2,555,338 5,063,383
Short-term investments    
FINANCIAL INSTRUMENTS    
Financial assets 821,518 1,024,411
Financial assets, at fair value 821,518 1,024,411
Trade accounts receivable    
FINANCIAL INSTRUMENTS    
Financial assets 2,798,420 3,576,699
Financial assets, at fair value 2,798,420 3,576,699
Related parties    
FINANCIAL INSTRUMENTS    
Financial assets 51,839 57,541
Financial assets, at fair value 51,839 57,541
Unrealized gains on financial instruments    
FINANCIAL INSTRUMENTS    
Financial assets   12,951
Financial assets, at fair value   12,951
Judicial deposits    
FINANCIAL INSTRUMENTS    
Financial assets 2,051,181 1,861,784
Financial assets, at fair value 2,051,181 1,861,784
Other current assets    
FINANCIAL INSTRUMENTS    
Financial assets 469,737 668,895
Financial assets, at fair value 469,737 668,895
Other non-current assets    
FINANCIAL INSTRUMENTS    
Financial assets 542,973 447,260
Financial assets, at fair value R$ 542,973 R$ 447,260