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Description of the business and summary of significant accounting policies - Foreign currency exchange differences and liabilities and provisions (Details) $ in Thousands | 12 Months Ended |  |  |  |
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Dec. 31, 2019 $ / $ Q / $ | Dec. 31, 2019 $ / $ ₡ / $ | Dec. 31, 2019 USD ($) $ / $ | Dec. 31, 2019 MXN ($) $ / $ | Dec. 31, 2018 $ / $ Q / $ | Dec. 31, 2018 $ / $ ₡ / $ | Dec. 31, 2018 MXN ($) $ / $ | Dec. 31, 2017 $ / $ Q / $ | Dec. 31, 2017 $ / $ ₡ / $ | Dec. 31, 2017 MXN ($) $ / $ | Apr. 27, 2020 $ / $ | Dec. 31, 2019 Q / $ | Dec. 31, 2019 ₡ / $ | Dec. 31, 2019 USD ($) | Dec. 31, 2018 Q / $ | Dec. 31, 2018 ₡ / $ | Dec. 31, 2017 Q / $ | Dec. 31, 2017 ₡ / $
Description of the business and summary of significant accounting policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average exchange rate for year | 7.7066 | 590.9574 | 19.2618 |  | 7.5337 | 580.8534 |  | 7.3509 | 572.2000 |  |  |  |  |  |  |  |  |
Exchange rate as of end of the year | 18.8452 | 18.8452 | 18.8452 | 18.8452 | 19.6829 | 19.6829 | 19.6829 | 19.7354 | 19.7354 | 19.7354 | 24.6230 | 7.6988 | 573.4400 | 18.8452 | 7.7440 | 609.6100 | 7.3448 | 572.5600
Exchange differences on translation of foreign operations |  |  | $ 427,000 | $ 8,045 |  |  | $ 22,156 |  |  | $ (7,178) |  |  |  |  |  |  |  |

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- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of other comprehensive income, net of tax, related to exchange differences when financial statements of foreign operations are translated. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_91_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + Details
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- References No definition available. + Details
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