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FINANCIAL INSTRUMENTS - Prospective and retrospective tests (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Unrealized gains on financial instruments      
Current assets   R$ 2,557  
Non-current assets   10,394  
Unrealized losses on financial instruments      
Current liabilities   (6,584)  
Non-current liabilities R$ (1,267)    
Net Income      
Gains on financial instruments 9,666 33,753  
Losses on financial instruments (19,107) (72,683)  
Gains (losses) on financial instruments recognized in Net Income (9,441) (38,930) R$ 87,085
Other comprehensive income      
Gains on financial instruments (11,364) 212 R$ 17,283
Gains on financial instruments recognized in other comprehensive income (11,364) 212  
Unrealized gains on financial instruments      
Unrealized gains on financial instruments      
Current assets   2,557  
Non-current assets   10,394  
Unrealized gains on financial instruments   12,951  
Unrealized losses on financial instruments      
Unrealized losses on financial instruments      
Current liabilities   (6,584)  
Non-current liabilities (1,267)    
Unrealized losses on financial instruments R$ (1,267) R$ (6,584)