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Stockholders equity and dividend payment - Stockholders equity (Details) - $ / shares | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Common Stock [Member] |  |  |
Stockholders' equity |  |  |
Common stock issued | 142,417,407 | 93,433,804 | 92,909,936
Restricted stock issued | 1,259,208 | 883,699 |
Number of treasury shares |  | (359,831) |
New shares issued | 47,724,395 |  |
Par value | $ 0.01 |  |
Shares to be issued assuming conversion of convertible notes* | 20,904,879 |  |
Number of shares authorized for issue | 250,000,000 |  |
Preferred Stock [Member] |  |  |
Stockholders' equity |  |  |
Par value | $ 0.01 |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References No definition available. + Details
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- Definition The number of treasury shares + References No definition available. + Details
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- Definition Number of shares of Restricted Stock issued. + References No definition available. + Details
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- Definition The number of shares to be issued assuming conversion of convertible notes. + References No definition available. + Details
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- Definition Disclosure of stockholders' equity. + References No definition available. + Details
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- Definition The number of shares authorised. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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- Details
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