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Financial risk management, objectives and policies, Credit risk (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) Vessel Counterparty Institution Customer | Dec. 31, 2018 USD ($) Vessel Counterparty | Dec. 31, 2017 Vessel Counterparty
Credit risk [Abstract] |  |  |  |
Number of vessels chartered with counterparties | Vessel |  | 5 | 5 | 6
Number of vessels | Vessel |  | 27 | 27 | 26
Number of counterparties | Counterparty |  | 4 | 4 | 4
Number of vessels operated in spot market | Vessel |  | 22 | 22 | 20
Number of financial institutions for holding cash | Institution |  | 5 |  |
Number of major customers | Customer |  | 5 |  |
Current trade receivables | [1] | $ 107,848 | $ 60,196 |
Disclosure of maximum credit exposure [Abstract] |  |  |  |
Cash and cash equivalents |  | 67,356 | 94,944 |
Accounts receivable and accrued revenues |  | 107,848 | 60,196 |
Maximum credit exposure |  | 175,204 | $ 155,140 |
Customer One [Member] |  |  |  |
Credit risk [Abstract] |  |  |  |
Current trade receivables |  | 7,491 |  |
Customer Two [Member] |  |  |  |
Credit risk [Abstract] |  |  |  |
Current trade receivables |  | 6,840 |  |
Customer Three [Member] |  |  |  |
Credit risk [Abstract] |  |  |  |
Current trade receivables |  | 5,983 |  |
Customer Four [Member] |  |  |  |
Credit risk [Abstract] |  |  |  |
Current trade receivables |  | 5,403 |  |
Customer Five [Member] |  |  |  |
Credit risk [Abstract] |  |  |  |
Current trade receivables |  | $ 4,604 |  |
[1] | Amortized cost.

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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 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_36_a&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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