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EARNINGS / (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Basic earnings / (loss) per share |  |  |  |
Earnings / (loss) attributable to owners of the parent | $ 155,304 | $ 69,220 |  | $ (219,274)
Weighted average number of shares, basic (in shares) | 606,407,693 | 546,559,599 | [1] | 545,547,819
Basic earnings / (loss) per share (US$) (in dollars per share) | $ 0.2561 | $ 0.12665 |  | $ (0.40193)
Diluted earnings / (loss) per share |  |  |  |
Earnings / (loss) attributable to owners of the parent | $ 155,304 | $ 69,220 |  | $ (219,274)
Weighted average number of shares, basic (in shares) | 606,407,693 | 546,559,599 | [1] | 545,547,819
Weighted average number of shares, diluted (in shares) | 606,407,693 | 546,559,599 |  | 545,547,819
Diluted earnings / (loss) per share (US$) (in dollars per share) | $ 0.2561 | $ 0.12665 |  | $ (0.40193)
[1] | In the calculation of diluted earnings per share have not been considered the compensation plan disclosed in Note 34 (a.1), because the average market price is lower than the price of options.

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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_66&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_66&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The profit (loss) attributable to owners of the parent. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 81B -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_81B_a_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References No definition available. + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References No definition available. + Details
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