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Financial instruments by category (Schedule of Fair Value Hierarchy) (Details) - Recurring fair value measurement [member] - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Categories of financial assets [abstract] |  |
Derivative financial assets | $ 553 | $ 1,836
Liabilities |  |
Derivative financial liabilities | 20,757 | 15,094
Money Market Fund [Member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 427 | 823
Level 1 of fair value hierarchy [member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 427 | 823
Liabilities |  |
Derivative financial liabilities | 0 | 0
Level 1 of fair value hierarchy [member] | Money Market Fund [Member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 427 | 823
Level 2 of fair value hierarchy [member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 126 | 1,013
Liabilities |  |
Derivative financial liabilities | 20,757 | 15,094
Level 2 of fair value hierarchy [member] | Money Market Fund [Member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 0 | 0
Commodity price risk [member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 126 | 1,013
Liabilities |  |
Derivative financial liabilities | 20,757 | 15,094
Commodity price risk [member] | Level 1 of fair value hierarchy [member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 0 | 0
Liabilities |  |
Derivative financial liabilities | 0 | 0
Commodity price risk [member] | Level 2 of fair value hierarchy [member] |  |
Categories of financial assets [abstract] |  |
Derivative financial assets | 126 | 1,013
Liabilities |  |
Derivative financial liabilities | $ 20,757 | $ 15,094

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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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