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Shareholders' equity, net - Dividends declared and paid (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Shareholders' equity, net [Line Items] |  |  |
Dividends declared and paid | $ (5,140) | $ (28,598) | $ (28,420)
Dividend 2019 [Member] |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |
Dividends declared and paid |  | (22,098) |
Dividend 2019 [Member] | Annual General Meeting [Member] |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |
Dividends declared and paid |  | (15,240) |
Dividend 2019 [Member] | Directors Meeting [Member] |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |
Dividends declared and paid |  | (6,858) |
Dividends 2018 [Member] |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |
Dividends declared and paid |  |  | (22,860)
Dividends 2018 [Member] | Annual General Meeting [Member] |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |
Dividends declared and paid |  |  | (7,621)
Dividends 2018 [Member] | Directors Meeting [Member] |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |
Dividends declared and paid |  |  | (15,239)
Common shares [member] | Dividend 2019 [Member] | Annual General Meeting [Member] |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |
Dividends declared and paid |  | $ (16,538) |
Dividends paid, ordinary shares per share |  | $ 0.06 |
Common shares [member] | Dividend 2019 [Member] | Directors Meeting [Member] |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |
Dividends declared and paid |  | $ (7,442) |
Dividends paid, ordinary shares per share |  | $ 0.03 |
Common shares [member] | Dividends 2018 [Member] | Annual General Meeting [Member] |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |
Dividends declared and paid |  |  | $ (8,269)
Dividends paid, ordinary shares per share |  |  | $ 0.030
Common shares [member] | Dividends 2018 [Member] | Directors Meeting [Member] |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |
Dividends declared and paid |  |  | $ (16,538)
Dividends paid, ordinary shares per share |  |  | $ 0.060
Treasury shares [member] | Dividend 2019 [Member] | Annual General Meeting [Member] |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |
Dividends declared and paid |  | $ (1,298) |
Treasury shares [member] | Dividend 2019 [Member] | Directors Meeting [Member] |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |
Dividends declared and paid |  | $ (584) |
Treasury shares [member] | Dividends 2018 [Member] | Annual General Meeting [Member] |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |
Dividends declared and paid |  |  | $ (648)
Treasury shares [member] | Dividends 2018 [Member] | Directors Meeting [Member] |  |  |
Disclosure of Shareholders' equity, net [Line Items] |  |  |
Dividends declared and paid |  |  | $ (1,299)

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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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- Definition The amount of dividends paid per ordinary share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2020-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=34&code=ifrs-tx-2020-en-r&anchor=para_16A_f&doctype=Standard -URIDate 2020-01-01 + Details
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