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Financial risk management, objectives and policies, Market risk (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) Swap | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Market risk [Abstract] |  |  |
Number of interest rate swaps | Swap | 9 |  |
Interest rate swaps total aggregate notional amount | $ 379,916 | $ 402,049 |
Increase (decrease) in profit (loss) due to change in interest rates by fifty basis points | $ (1,805) | $ (2,152) | $ (3,099)

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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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