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Stockholders' equity and dividend payment, Stockholders' equity (Details) | 12 Months Ended
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Dec. 31, 2020 Vote $ / shares shares | Dec. 31, 2019 shares
Common Stock [Abstract] |  |
Number of vote per common stock | Vote | 1 |
Common Stock [Member] |  |
Stockholders' Equity [Abstract] |  |
Issued, Beginning balance (in shares) | 146,819,401 | 142,700,046
Restricted stock issued (in shares) | 601,530 | 790,571
Conversion of convertible bonds (in shares) | 23,377,397 | 4,390,025
Retirement of treasury shares (in shares) |  | (1,061,241)
Issued, Ending balance (in shares) | 170,798,328 | 146,819,401
Par value (in dollars per share) | $ / shares | $ 0.01 |
Number of shares authorized for issue (in shares) | 250,000,000 |
Preference Shares [Member] |  |
Stockholders' Equity [Abstract] |  |
Par value (in dollars per share) | $ / shares | $ 0.01 |

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- Definition The increase (decrease) in the number of shares of equity resulting from the conversion of convertible instruments during the period. + 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 authorised. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 79 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_79_a_i&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_106_d&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_79_a_iii&doctype=Standard -URIDate 2020-01-01 + Details
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