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CONSOLIDATED STATEMENTS OF CASH FLOWS - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities |  |  |
Net income (loss) for the year | R$ (338,667) | R$ (2,885,929) | R$ (4,595,986)
Adjustments to reconcile net income for the year to net cash provided by operating activities |  |  |
Depreciation and amortization | 2,092,551 | 2,535,955 | 2,607,909
Impairment of Assets | 1,114,807 | 2,917,911 | 4,996,240
Equity in earnings of unconsolidated companies | 34,597 | 12,771 | 24,502
Exchange variation, net | 4,057 | (851,635) | 1,564,017
Losses (Gains) on financial instruments, net | 9,441 | 38,930 | (87,085)
Post-employment benefits | 192,724 | 229,767 | 233,287
Stock based remuneration | 35,576 | 46,683 | 48,589
Income tax | 295,391 | 304,314 | (1,498,422)
Gains on disposal of property, plant and equipment | (69,510) | (43,340) | (3,971)
Gains and losses on assets held for sale and sales of interest in subsidiaries and associates | 721,682 | 58,223 |
Allowance for doubtful accounts | 18,342 | 68,781 | 127,701
Provision for tax, labor and civil claims | (110,281) | 347,882 | 323,314
Reversal of contingent liabilities, net | (929,711) |  |
Interest income on investments | (75,387) | (107,980) | (153,631)
Interest expense on loans | 1,323,448 | 1,540,797 | 1,471,526
Reversal of monetary update of contingent liabilities, net | (369,819) |  |
Interest on loans with related parties | (95) | 2,457 | (2,712)
(Reversal) Provision for net realisable value adjustment in inventory | (20,195) | (31,492) | 17,536
Cash flows from operations before changes in working capital | 3,928,951 | 4,184,095 | 5,072,814
Changes in assets and liabilities |  |  |
(Increase) Decrease in trade accounts receivable | (54,690) | 64,805 | 1,219,605
(Increase) Decrease in inventories | (1,269,455) | 794,591 | 1,977,361
Increase (Decrease) in trade accounts payable | 800,164 | 110,466 | (768,627)
Increase in other receivables | (371,745) | (275,938) | (270,391)
Decrease in other payables | (56,909) | (287,487) | (509,227)
Dividends from joint ventures | 40,644 | 124,495 | 52,769
Purchases of trading securities | (2,390,104) | (880,436) | (1,958,522)
Proceeds from maturities and sales of trading securities | 2,905,411 | 1,089,972 | 3,929,971
Cash provided by operating activities | 3,532,267 | 4,924,563 | 8,745,753
Interest paid on loans and financing | (1,330,116) | (1,240,165) | (946,041)
Income and social contributions taxes paid | (126,023) | (168,032) | (637,394)
Net cash provided by operating activities | 2,076,128 | 3,516,366 | 7,162,318
Cash flows from investing activities |  |  |
Purchases of property, plant and equipment | (873,329) | (1,323,891) | (2,324,718)
Proceeds from sales of property, plant and equipment, investments and other intangibles | 554,457 | 308,694 | 90,942
Purchases of other intangibles | (37,939) | (54,044) | (126,428)
Payment for business acquisitions, net of cash of acquired entities |  |  | (20,929)
Capital increase in jointly-controlled entity | (178,670) |  | (40,524)
Net cash used in investing activities | (535,481) | (1,069,241) | (2,421,657)
Cash flows from financing activities |  |  |
Purchase of treasury shares |  | (95,343) | (189,071)
Dividends and interest on capital paid | (86,386) | (85,962) | (358,226)
Proceeds from loans and financing | 3,265,860 | 2,455,371 | 3,042,783
Repayment of loans and financing | (7,241,401) | (4,605,406) | (5,028,386)
Intercompany loans, net | 5,797 | (6,492) | 30,126
Increase in controlling interests in subsidiaries |  |  | (339,068)
Net cash used in financing activities | (4,056,130) | (2,337,832) | (2,841,842)
Exchange variation on cash and cash equivalents | 7,438 | (693,990) | 699,290
(Decrease) Increase in cash and cash equivalents | (2,508,045) | (584,697) | 2,598,109
Cash and cash equivalents at beginning of year | 5,063,383 | 5,648,080 | 3,049,971
Cash and cash equivalents at end of year | R$ 2,555,338 | R$ 5,063,383 | R$ 5,648,080

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- Definition The cash outflow for dividends paid by the entity, classified as financing activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 31 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_31&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The effect of exchange rate changes on cash and cash equivalents held or due in a foreign currency. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 28 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_28&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The cash flows from income taxes paid or refunded, classified as operating activities. [Refer: Income taxes paid (refund)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 35 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_35&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 14 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_14_f&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The cash outflow for changes in ownership interests in subsidiaries that do not result in a loss of control. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 42A -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_42A&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 42B -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_42B&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The cash outflow to acquire or redeem entity's shares. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 17 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_17_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The cash inflow from borrowings obtained. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 17 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_17_c&doctype=Standard -URIDate 2017-03-09 + Details
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