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3. SALE OF FOREIGN SUBSIDIARY (Details 3) - BRL (R$) R$ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SaleOfForeignSubsidiaryLineItems [Line Items] |  |  |  |  |
Net cash provided by (used) by operating activities |  |  | R$ 2,208,105 | R$ 571,851 | R$ 275,918
Net cash provided by (used) by investing activities |  |  | (98,459) | (1,049,224) | (2,305,168)
Net cash provided by (used) by financing activities |  |  | (3,257,186) | (993,755) | (883,012)
Increase (decrease) in cash and cash equivalents for the period |  |  | (1,163,568) | (1,459,590) | (2,989,890)
Cash and cash equivalents at the beginning of the year | R$ 3,411,572 | R$ 4,871,162 | 3,411,572 | 4,871,162 | 7,861,052
Cash and cash equivalents at the end of the year |  |  | 2,248,004 | 3,411,572 | 4,871,162
LLC |  |  |  |  |
SaleOfForeignSubsidiaryLineItems [Line Items] |  |  |  |  |
Net cash provided by (used) by operating activities | 149,691 | (69,216) |  |  |
Net cash provided by (used) by investing activities | (6,269) | (2,492) |  |  |
Net cash provided by (used) by financing activities | (176,592) | (1,860) |  |  |
Increase (decrease) in cash and cash equivalents for the period | (33,170) | (73,568) |  |  |
Cash and cash equivalents at the beginning of the year | 33,930 | 112,428 | R$ 33,930 | 112,428 |
Cash and cash equivalents at the end of the year | 760,000 | R$ 38,860 |  | R$ 33,930 | R$ 112,428
Net cash received from the sale of the asset | 1,525,590 |  |  |  |
Cash and cash equivalents transferred on the sale of the assets | (760) |  |  |  |
Working capital received | 145,529 |  |  |  |
Net cash provided by the sale of assets | R$ 1,670,359 |  |  |  |

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