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19. RELATED-PARTY BALANCES AND TRANSACTIONS (Details 2) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of transactions between related parties [line items] |  |  |
Related party revenues | R$ 1,278,751 | R$ 880,145 | R$ 878,992
Related party expenses | (1,418,282) | (1,176,930) | (1,099,851)
Foreign exchange and monetary variation, net | 13,611 |  | (18,398)
Related party transactions, net | (77,124) | (235,236) | (181,478)
Purchases |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party expenses | (1,418,282) | (1,176,930) | (1,099,851)
Interest |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party expenses | (16,092) |  | (3,185)
Sales |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party revenues | 1,278,751 | 880,145 | 878,992
Interest |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Related party revenues | R$ 64,888 | R$ 61,549 | R$ 60,964

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