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Financial instruments by category (Schedule of Cash at Bank and Other Financial Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | $ 190,688 | $ 265,466
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 | 115,334 | 215,276
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 | 53,114 | 122,229
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 | 27,257 | 44,808
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 | 3,529 | 18,119
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 | 8 | 0
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] | External credit rating B2 [Member] |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | 21 | 0
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 | 67 | 2,343
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 | 1,605 | 574
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 | 3,708 | 2,146
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 | 5,117 | 43
Financial assets neither past due nor impaired [member] | Cash at bank and other financial asset [Member] | External Credit Grade Aa2 [Member] |  |
Disclosure of Financial instrument category [Line Items] |  |
Financial assets | 0 | 1,073
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 | $ 20,908 | $ 23,941

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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 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35H&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35I&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35M&doctype=Standard -URIDate 2021-03-24 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35N&doctype=Standard -URIDate 2021-03-24 + Details
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