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6. TRADE RECEIVABLES (Details) - 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 | Domestic market |  |
Disclosure of fair value measurement of assets [line items] |  |
Trade receivables | 1,369,396 | 1,290,823
Third parties | Foreign market |  |
Disclosure of fair value measurement of assets [line items] |  |
Trade receivables | 852,821 | 982,846
Allowance for doubtful accounts |  |
Disclosure of fair value measurement of assets [line items] |  |
Trade receivables | (237,352) | (191,979)
Subtotal |  |
Disclosure of fair value measurement of assets [line items] |  |
Trade receivables | 1,984,865 | 2,081,690
Related parties |  |
Disclosure of fair value measurement of assets [line items] |  |
Trade receivables | R$ 93,317 | R$ 115,388

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