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Stockholders' equity and dividend payment, Dividend payment (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Feb. 25, 2021 | Nov. 25, 2020 | Sep. 02, 2020 | May 26, 2020 | Feb. 25, 2020 | Nov. 14, 2019 | Aug. 29, 2019 | May 28, 2019 | Feb. 26, 2019 | Nov. 23, 2018 | Aug. 31, 2018 | May 30, 2018 | Feb. 28, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Dividend Payment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total payment |  | $ 34,200 | $ 82,000 | $ 51,500 | $ 47,000 | $ 7,300 | $ 2,800 | $ 11,400 | $ 7,100 | $ 2,900 | $ 2,900 | $ 2,900 | $ 2,900 | $ 214,669 | $ 28,685 | $ 11,487
Per common share (in dollars per share) |  | $ 0.20 | $ 0.48 | $ 0.35 | $ 0.32 | $ 0.05 | $ 0.02 | $ 0.08 | $ 0.05 | $ 0.02 | $ 0.02 | $ 0.02 | $ 0.02 | $ 1.35 | $ 0.20 | $ 0.08
Subsequent Events [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Payment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per common share (in dollars per share) | $ 0.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable date | Feb. 25, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend paid, record date | Feb. 18, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend paid | $ 8,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of dividends recognised as distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 107 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_107&doctype=Standard -URIDate 2020-01-01 + Details
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