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20. PAYMENT TO SHAREHOLDERS (Details)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
BRL (R$)
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Approved dividends R$ 975,000
Paid dividends R$ 974,827
Dividend 1  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Approval year 2014
Approved dividends R$ 700,000
Payment year 2014
Paid dividends R$ 424,939
Dividend 2  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Approved dividends
Payment year 2015
Paid dividends R$ 274,917
Dividend 3  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Approval year 2015
Approved dividends R$ 275,000
Payment year 2015
Paid dividends R$ 274,918
Dividend 4  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Approval year 2016
Approved dividends [1]
Payment year 2016
Paid dividends R$ 53
Dividend 5  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Approval year 2017
Approved dividends [1]
Payment year 2017
Paid dividends R$ 0
[1] There is no dividend deliberation on the year of 2016 and 2017.