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Financial risks - Disclosure of detailed information about foreign currency risk (Details) $ in Thousands, $ in Thousands | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($)
--- | --- | --- | --- | --- | ---
Disclosure Of Financial Risks [Line Items] |  |  |  |  |
Cash | $ 108,223 |  | $ 174,265 |  | $ 333,705
Amounts receivable | 6,330 |  | 12,321 |  |
Accounts payable and accrued liabilities | (18,772) |  | (11,732) |  |
Revolving credit facility | (19,482) |  | (30,000) |  |
Equivalent in CDN [Member] |  |  |  |  |
Disclosure Of Financial Risks [Line Items] |  |  |  |  |
Net exposure in foreign currencies | $ 41,234 |  | $ 54,987 |  |
Amounts held in US dollars [Member] |  |  |  |  |
Disclosure Of Financial Risks [Line Items] |  |  |  |  |
Cash |  | $ 46,267 |  | $ 38,677 |
Amounts receivable |  | 0 |  | 1,011 |
Other assets |  | 567 |  | 641 |
Accounts payable and accrued liabilities |  | (86) |  | (22) |
Revolving credit facility |  | (15,000) |  | 0 |
Net exposure in foreign currencies |  | $ 31,748 |  | $ 40,307 |

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- Definition The amount of cash on hand and demand deposits. [Refer: Cash on hand] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of assets that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of current trade receivables and current other receivables. [Refer: Current trade receivables; Other current receivables] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_h&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of loans received from banks that have not been secured by collateral. [Refer: Loans received] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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