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Financial risk management, objectives and policies, Nordea Credit Facility (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
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Nov. 30, 2020 USD ($) | Aug. 31, 2020 USD ($) | May 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2017 USD ($) Carrier | Apr. 30, 2017 USD ($) Building | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Aug. 31, 2018 | Jun. 30, 2018 USD ($)
Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Borrowing amount |  |  |  |  |  |  | $ 449,959 | $ 850,972 |  |  |  |
Nordea Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Term |  |  |  |  |  |  | 6 years |  |  |  |  |
Borrowing amount |  |  |  |  | $ 204,000 | $ 300,000 | $ 109,423 | $ 207,175 |  |  |  | $ 96,000
Number of VLCCs Delivered | Carrier |  |  |  |  | 9 |  |  |  |  |  |  |
Credit facility covenant, required adjusted tangible net worth |  |  |  |  |  |  | $ 300,000 |  |  |  |  |
Frequency of periodic repayment |  |  |  |  |  |  | Quarterly |  |  |  |  |
Debt repayment installment amount |  |  |  |  |  |  | $ 4,200 |  |  |  |  |
Debt prepayment before installment term | $ 25,800 | $ 37,000 | $ 25,800 | $ 35,000 |  |  |  |  |  |  |  |
Nordea Credit Facility [Member] | Bottom of Range [Member] |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility covenant, required percentage of charter-free market value of vessels to borrowings |  |  |  |  |  |  | 135.00% |  |  |  |  |
Credit facility covenant, required percentage of adjusted tangible net worth to total assets |  |  |  |  |  |  | 25.00% |  |  |  |  |
Credit facility covenant, required unencumbered consolidated cash |  |  |  |  |  |  | $ 30,000 |  |  |  |  |
Credit facility covenant, required percentage of unencumbered consolidated cash to gross interest bearing debt |  |  |  |  |  |  | 6.00% |  |  |  |  |
Nordea Credit Facility [Member] | Second Quarter of 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Debt repayment final amount |  |  |  |  |  |  | $ 82,300 |  |  |  |  |
Nordea Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to interest rate basis |  |  |  |  |  |  | 2.40% |  |  |  |  | 2.40%
Nordea Credit Facility [Member] | Scrubbers [Member] |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Frequency of periodic repayment |  |  |  |  |  |  | Quarterly |  |  |  |  |
Debt repayment installment amount |  |  |  |  |  |  | $ 2,250 |  |  |  |  |
Secured commitment related to financing |  |  |  |  |  |  |  |  | $ 45,000 | $ 50,000 |  |
Nordea Credit Facility [Member] | Scrubbers [Member] | Second Quarter of 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Debt repayment final amount |  |  |  |  |  |  | $ 18,000 |  |  |  |  |
Nordea Credit Facility [Member] | Scrubbers [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Adjustment to interest rate basis |  |  |  |  |  |  |  |  |  |  | 2.40% |
Nordea Credit Facility [Member] | New Buildings [member] |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of newbuilding contracts | Building |  |  |  |  |  | 2 |  |  |  |  |  |

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- Definition The amount of adjusted tangible net worth required to be maintained to fulfill Credit facility covenant. + References No definition available. + Details
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- Definition The percentage of adjusted tangible net worth to adjusted total assets value required to be maintained to fulfill Credit facility covenant. + References No definition available. + Details
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- Definition The percentage of unencumbered consolidated cash to gross interest bearing debt required to be maintained to fulfill credit facility covenant. + References No definition available. + Details
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- Definition The amount of unencumbered consolidated cash required to be maintained to fulfill Credit facility covenant. + References No definition available. + Details
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- Definition Refers to the required percentage of the charter-free market value of the vessels to the borrowings under the covenants of the credit facility. + References No definition available. + Details
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- Definition Represents the period between issuance and maturity of credit facility, period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of the required periodic installment payments including both interest and principal payments. + References No definition available. + Details
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- Definition The amount of prepayment of debt for final settlement. + References No definition available. + Details
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- Definition The description of the frequency of periodic repayment of credit facility. + References No definition available. + Details
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- Definition The amount of Commitment funding that the entity is obligated to repay towards financing activities. + References No definition available. + Details
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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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