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Financial risk management, objectives and policies - Maximum exposure to credit risk (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of credit risk exposure [abstract] |  |
Cash and cash equivalents | $ 94,944 | $ 77,292
Accounts receivable and accrued revenues | 60,196 | 42,212
Maximum credit exposure | $ 155,140 | $ 119,504

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- Definition The amount of cash and cash equivalents to manage financial risk. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35K_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_36_a&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The maximum exposure to the credit risk of loans or receivables. [Refer: Loans and receivables; Credit risk [member]; Maximum exposure to credit risk] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 9 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_9_a&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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