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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

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