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Financial risk management, objectives and policies, The ABN AMRO Revolving Credit Facility (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 30, 2018 | Nov. 30, 2016
Credit Facility [Abstract] |  |  |  |  |  |
Borrowing amount |  |  | $ 850,972 | $ 967,275 |  |
Frequency of periodic repayment |  |  | Quarterly |  |  |
ABN AMRO Revolving Credit Facility [Member] |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |
Term |  |  | 5 years |  |  |
Maximum borrowing capacity |  |  |  |  | $ 57,300 | $ 50,000
Borrowing amount |  |  | $ 0 |  |  |
Frequency of periodic repayment |  |  | Quarterly |  |  |
Reduction amount in credit facility | $ 1,800 | $ 1,300 |  |  |  |
Credit facility covenant to maintain adjusted tangible net worth |  |  | $ 300,000 |  |  |
ABN AMRO Revolving Credit Facility [Member] | Bottom of Range [Member] |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |
Covenants requiring all times charter-free market value of vessels |  |  | 135.00% |  |  |
Percentage of covenant to maintain adjusted tangible net worth to total assets for credit facility |  |  | 25.00% |  |  |
Credit facility covenant to maintain encumbered cash |  |  | $ 30,000 |  |  |
Percentage of covenant required unencumbered consolidated cash to gross interest-bearing debt for credit facility |  |  | 6.00% |  |  |
ABN AMRO Revolving Credit Facility [Member] | LIBOR [Member] |  |  |  |  |  |
Credit Facility [Abstract] |  |  |  |  |  |
Adjustment to interest rate basis |  |  | 2.50% |  |  | 2.50%

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- Definition Refers to percentage of Credit Facility contains a covenant requiring that at all times the charter-free market value of the vessels that secure the Credit Agricole Credit Facility of borrowings. + References No definition available. + Details
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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 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 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + Details
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