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6. TRADE RECEIVABLES (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of fair value measurement of assets [line items]    
Trade receivables R$ 2,078,182 R$ 2,197,078
Third parties    
Disclosure of fair value measurement of assets [line items]    
Trade receivables 2,222,217 2,273,669
Third parties | Current    
Disclosure of fair value measurement of assets [line items]    
Trade receivables 1,514,847 1,391,839
Third parties | Past-due up to 30 days    
Disclosure of fair value measurement of assets [line items]    
Trade receivables 177,287 167,760
Third parties | Past-due up to 180 days    
Disclosure of fair value measurement of assets [line items]    
Trade receivables 47,684 142,346
Third parties | Past-due over 180 days    
Disclosure of fair value measurement of assets [line items]    
Trade receivables R$ 482,399 R$ 571,724