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9. INVESTMENTS (Details 4) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of fair value measurement of assets [line items] |  |  |
Net revenues | R$ 22,968,885 | R$ 18,524,601 | R$ 17,148,949
Cost of sales and services | 16,105,657 | 13,596,141 | 12,640,042
Gross profit | 6,863,228 | 4,928,460 | 4,508,907
Operating (expense) income | 83,332 | (1,944,495) | (2,563,431)
Finance income (costs), net | (1,495,643) | (2,463,627) | (2,522,427)
Income before income tax and social contribution | 5,450,917 | 520,338 | (576,951)
Current and deferred income tax and social contribution | 250,334 | 409,109 | 266,546
Profit (loss) for the year | (5,200,583) | (111,229) | R$ 853,058
Ita Energetica | Joint Operation |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Net revenues | 166,358 | 168,194 |
Cost of sales and services | (77,829) | (76,810) |
Gross profit | 88,529 | 91,384 |
Operating (expense) income | (60,104) | (58,465) |
Finance income (costs), net | (126) | 317 |
Income before income tax and social contribution | 28,299 | 33,236 |
Current and deferred income tax and social contribution | (9,452) | (11,105) |
Profit (loss) for the year | 18,847 | 22,131 |
Joint Venture | MRS Logistica |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Net revenues | 3,726,448 | 3,492,805 |
Cost of sales and services | (2,476,628) | (2,307,108) |
Gross profit | 1,249,820 | 1,185,697 |
Operating (expense) income | (313,606) | (283,151) |
Finance income (costs), net | (151,839) | (187,295) |
Income before income tax and social contribution | 784,375 | 715,251 |
Current and deferred income tax and social contribution | (262,760) | (254,001) |
Profit (loss) for the year | 521,615 | 461,250 |
Joint Venture | CBSI |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Net revenues | 166,080 | 135,399 |
Cost of sales and services | (142,254) | (120,647) |
Gross profit | 23,826 | 14,752 |
Operating (expense) income | (10,884) | (8,340) |
Finance income (costs), net | (179) | (1,004) |
Income before income tax and social contribution | 12,763 | 5,408 |
Current and deferred income tax and social contribution | (3,761) | (1,838) |
Profit (loss) for the year | 9,002 | 3,570 |
Joint Venture | Transnordestina Logistica |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Net revenues |  | 0 |
Cost of sales and services |  | 0 |
Gross profit |  | 0 |
Operating (expense) income | (18,020) | (32,245) |
Finance income (costs), net | (26,103) | (13,938) |
Income before income tax and social contribution | (44,123) | (46,183) |
Current and deferred income tax and social contribution |  | 0 |
Profit (loss) for the year | R$ (44,123) | R$ (46,183) |

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