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Disclosures on equity (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 28, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 22, 2017 | Aug. 23, 2017 | May 17, 2017 | Nov. 23, 2016 | Dec. 31, 2015
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
Provisional dividend payable per share |  | $ 0.20248 |  | $ 0.42879 | $ 0.38432 | $ 0.39222 | $ 0.85487 |
debt equity ratio |  | 1.2 |  |  |  |  |  |
Liquidity level maintained |  | the Company has maintained a liquidity level of 3 times during the last periods. |  |  |  |  |  |
Number of shareholders called for meeting |  | A general or extraordinary shareholders' meeting may be called at the request of shareholders representing 5% of the Company's Series B shares. |  |  |  |  |  |
Actuarial assumption of discount rates |  | 5.114% | 4.522% |  |  |  |  | 4.89%
Dividend payable per share | $ 1.05735 |  |  |  |  |  |  |
interim dividend paid |  | $ 150,000,000 |  |  |  |  |  |
interim dividend per share |  | $ 0.56992 |  |  |  |  |  |
Description of information about distribution of dividends | At an extraordinary meeting held on April 11, 2017, the Company’s Board of Directors made a recommendation for discussion at the Ordinary Shareholders’ Meeting (the Meeting), which was held on April 28, 2017, that the Company should distribute and pay dividends based on 100% of the Company’s net profit for distribution for the financial year 2016. This recommendation was accepted by the Meeting. |  |  |  |  |  |  |
Provisional dividend paid, Per share |  |  | $ 0.85487 |  |  |  |  |
Provisional dividend payable |  |  |  |  |  |  | $ 225,000,000 |
Domestic defined benefit plans [member] |  |  |  |  |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
Actuarial assumption of discount rates |  |  | 5.50% |  |  |  |  | 5.50%
Hundrad percent distribution [Member] |  |  |  |  |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
Description of financial covenants compliance to distribute dividends |  | (i) 100% of the profit for 2017 if all the following financial parameters are met: (a) that the total of cash and cash equivalents and other current financial assets (“Cash”) divided by the addition of other current financial liabilities (the“Short-term Financial Liabilities”) is equal to or more than 2.5 times, and (b) the total of current liabilities and non-current liabilities (“Total Liabilities”) divided by total equity (“Equity”) is equal to or less than 1.1 times. |  |  |  |  |  |
Eighty percent distribution [Member] |  |  |  |  |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
Description of financial covenants compliance to distribute dividends |  | 80% of profit for 2017 if all the following financial parameters are met: (a) that Cash divided by Short-term Financial Liabilities is equal to or more than 2.0 times, and (b) Total Liabilities divided by Total Equity is equal to or less than 1.2 times. |  |  |  |  |  |
Sixty percent distribution [Member] |  |  |  |  |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
Description of financial covenants compliance to distribute dividends |  | (iii) 60% of profit for 2017 if all the following financial parameters are met: (a) that Cash divided by Short-term Financial Liabilities is equal to or more than 1.5 times, and (b) Total Liabilities divided by Total Equity is equal to or less than 1.3 times. Should none of these parameters be met, the Company will distribute and pay as dividend 50% of the profit for 2017 to the respective shareholders. |  |  |  |  |  |
Indebtedness level [Member] |  |  |  |  |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
debt equity ratio |  | 1.5 |  |  |  |  |  |
Series A preferred shares [Member] |  |  |  |  |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
Number of shares issued and fully paid |  | 142,819,552 | 142,819,552 |  |  |  |  |
Series B preferred shares [Member] |  |  |  |  |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
Number of shares issued and fully paid |  | 120,376,972 | 120,376,972 |  |  |  |  |
Preference shares [member] |  |  |  |  |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
Number of shares issued and fully paid |  | 263,196,524 |  |  |  |  |  |
Bottom of range [member] |  |  |  |  |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |  |  |  |  |
Cash dividend rate |  | 30.00% |  |  |  |  |  |

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