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18. RELATED-PARTY BALANCES AND TRANSACTIONS (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of transactions between related parties [line items]    
Current assets R$ 162,987 R$ 488,603
Noncurrent assets 696,745 631,834
Current liabilities 138,071 61,550
Noncurrent liabilities 41,937 28,004
Total assets 859,732 1,120,437
Total liabilities 180,008 89,554
Accounts payable    
Disclosure of transactions between related parties [line items]    
Current liabilities 57,008 10,927
Noncurrent liabilities  
Total liabilities 57,008 10,927
Trade payables    
Disclosure of transactions between related parties [line items]    
Current liabilities 81,063 50,623
Noncurrent liabilities  
Total liabilities 81,063 50,623
Actuarial liabilities    
Disclosure of transactions between related parties [line items]    
Current liabilities  
Noncurrent liabilities 41,937 28,004
Total liabilities 41,937 28,004
Trade receivables    
Disclosure of transactions between related parties [line items]    
Current assets 115,388 129,837
Noncurrent assets  
Total assets 115,388 129,837
Dividends receivable    
Disclosure of transactions between related parties [line items]    
Current assets 41,528 37,679
Noncurrent assets  
Total assets 41,528 37,679
Actuarial asset    
Disclosure of transactions between related parties [line items]    
Current assets  
Noncurrent assets 111,281 119,854
Total assets 111,281 119,854
Short-term investments/Investments    
Disclosure of transactions between related parties [line items]    
Current assets 53 315,319
Noncurrent assets  
Total assets 53 315,319
Loans    
Disclosure of transactions between related parties [line items]    
Current assets 2,441
Noncurrent assets 554,694 479,960
Total assets 557,135 479,960
Other receivables    
Disclosure of transactions between related parties [line items]    
Current assets 3,577 5,768
Noncurrent assets 30,770 32,020
Total assets R$ 34,347 R$ 37,788