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FINANCIAL INSTRUMENTS - Changes in liabilities from Cash Flow from financing activities (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Related parties, net |  |  |
Changes in liabilities from Cash flow from financing activities |  |  |
Beginning of year | R$ (57,541) | R$ (53,506) | R$ (80,920)
Cash transactions |  |  |
Proceeds/(Repayment) from financing activities | 5,797 | (6,492) | 30,126
Non cash transactions |  |  |
Interest expense on loans and Interest on loans with related parties | (95) | 2,457 | (2,712)
End of year | (51,839) | (57,541) | (53,506)
Debt, Debentures And Losses/Gains On Financial Instruments, Net |  |  |
Changes in liabilities from Cash flow from financing activities |  |  |
Beginning of year | 20,576,866 | 26,417,256 | 19,488,733
Cash transactions |  |  |
Proceeds/(Repayment) from financing activities | (3,975,541) | (2,150,035) | (1,985,603)
Interest paid on loans and financing | (1,330,116) | (1,240,165) | (946,041)
Non cash transactions |  |  |
Interest expense on loans and Interest on loans with related parties | 1,323,448 | 1,540,797 | 1,471,526
Exchange variation, operations with subsidiaries and associate company and others | (83,806) | (3,990,987) | 8,388,641
End of year | R$ 16,510,851 | R$ 20,576,866 | R$ 26,417,256

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- Definition The increase (decrease) in liabilities arising from financing activities resulting from the effect of changes in foreign exchange rates. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 44B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_44B_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in liabilities arising from financing activities resulting from financing cash flows. [Refer: Cash flows from (used in) financing activities; Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 44B -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_44B_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of liabilities for which cash flows were, or future cash flows will be, classified in the statement of cash flows as cash flows from financing activities. [Refer: Cash flows from (used in) financing activities; Liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 44D -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_44D&doctype=Standard -URIDate 2017-03-09 + Details
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