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Financial instruments by category (Schedule of Cash at Bank and Other Financial Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | $ 223,231 | $ 190,688
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | 141,708 | 115,334
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] | External credit rating Aa3 [Member] |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | 10,362 | 8
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] | External credit rating A1 [Member] |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | 96,077 | 0
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] | External credit rating A2 [Member] |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | 57 | 53,114
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] | External credit rating A3 [Member] |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | 10,389 | 27,257
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] | External credit rating Baa1 [Member] |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | 39 | 1,605
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] | External credit rating Baa2 [Member] |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | 7,030 | 3,708
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] | External credit rating Ba1 [Member] |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | 64 | 67
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] | External credit rating Ba2 |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | 268 | 21
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] | External credit rating Ba3 [Member] |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | 3,066 | 5,117
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] | External credit rating B3 [Member] |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | 51 | 0
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] | Counterparties Without an External Credit Rating [Member] |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | 12,953 | 20,908
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] | External credit rating Aaa [Member] |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | 0 | 3,529
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] | External Credit rating Baa3 [Member] |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | $ 1,352 | $ 0

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35H&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35M&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35N&doctype=Standard -URIDate 2022-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_35I&doctype=Standard -URIDate 2022-03-24 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_25&doctype=Standard -URIDate 2022-03-24 + Details
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