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Financial risk management, objectives and policies, Credit risk (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) Vessel Counterparty Institution Customer | Dec. 31, 2019 USD ($) Vessel Counterparty | Dec. 31, 2018 Vessel Counterparty
Credit risk [Abstract] |  |  |  |
Number of vessels chartered with counterparties | Vessel |  | 18 | 5 | 5
Number of vessels | Vessel |  | 27 | 27 | 27
Number of counterparties | Counterparty |  | 10 | 4 | 4
Number of vessels operated in spot market | Vessel |  | 9 | 22 | 22
Number of financial institutions for holding cash | Institution |  | 6 |  |
Number of major customers | Customer |  | 5 |  |
Current trade receivables | [1] | $ 30,060 | $ 107,848 |
Disclosure of maximum credit exposure [Abstract] |  |  |  |
Cash and cash equivalents |  | 68,641 | 67,356 |
Accounts receivable and accrued revenues |  | 30,060 | 107,848 |
Maximum credit exposure |  | 98,700 | $ 175,204 |
Customer One [Member] |  |  |  |
Credit risk [Abstract] |  |  |  |
Current trade receivables |  | 9,380 |  |
Customer Two [Member] |  |  |  |
Credit risk [Abstract] |  |  |  |
Current trade receivables |  | 6,836 |  |
Customer Three [Member] |  |  |  |
Credit risk [Abstract] |  |  |  |
Current trade receivables |  | 5,962 |  |
Customer Four [Member] |  |  |  |
Credit risk [Abstract] |  |  |  |
Current trade receivables |  | 2,730 |  |
Customer Five [Member] |  |  |  |
Credit risk [Abstract] |  |  |  |
Current trade receivables |  | $ 2,454 |  |
[1] | Amortized cost.

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