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TRADE ACCOUNTS RECEIVABLE - Accounts receivable by aging (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
TRADE ACCOUNTS RECEIVABLE |  |
Trade accounts receivable - net | R$ 2,672,370 | R$ 3,201,656
Impairment on financial assets, net of recoveries, as a percentage of net sales | 0.05% | 0.02%
Accumulated impairment losses |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade accounts receivable - net | R$ (98,079) | R$ (158,157)
Current | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade accounts receivable - net | 2,226,121 | 2,362,408
Past due: Up to 30 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade accounts receivable - net | 381,999 | 792,569
Past due: From 31 to 60 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade accounts receivable - net | 58,972 | 63,294
Past due: From 61 to 90 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade accounts receivable - net | 30,202 | 10,133
Past due: From 91 to 180 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade accounts receivable - net | 15,384 | 22,261
Past due: From 181 to 360 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade accounts receivable - net | 16,739 | 26,003
Past due: Above 360 days | Gross |  |
TRADE ACCOUNTS RECEIVABLE |  |
Trade accounts receivable - net | R$ 41,032 | R$ 83,145

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