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Foreign exchange and derivative financial instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities, beginning balance | $ (3,126) | $ (13,575) | $ (16,877)
Credit Support Payments/(Receipts), beginning balance | 4,328 | 15,757 | 16,390
Net exposure, liabilities, beginning balance |  |  | (487)
Net exposure, assets, beginning balance | 1,202 | 2,182 |
Derivative financial instrument (loss)/gain, net | (22,441) | 10,967 | (18,534)
Gain/(Loss) on derivative financial instruments through OCI | (110) | (4,387) | 4,267
Gain/(Loss) on derivative financial instruments through finance costs | 71 | (186) | 3,461
Settlement of derivative financial instruments | 16,883 | 4,055 | 14,108
Credit support receipts on derivative financial instruments, net | (243) | (11,429) | (633)
Derivative financial liabilities, ending balance | (8,723) | (3,126) | (13,575)
Credit Support Payments/(Receipts), ending balance | 4,085 | 4,328 | 15,757
Net exposure, liabilities, ending balance | (4,638) |  |
Net exposure, assets, ending balance |  | 1,202 | 2,182
Cross Currency Interest Rate Swaps Economic Hedge |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities, beginning balance | (10,512) | (18,196) | (11,922)
Derivative financial instrument (loss)/gain, net | (13,766) | 7,684 | (6,274)
Gain/(Loss) on derivative financial instruments through OCI | 0 | 0 | 0
Gain/(Loss) on derivative financial instruments through finance costs | 0 | 0 | 0
Settlement of derivative financial instruments | 15,860 | 0 | 0
Derivative financial liabilities, ending balance | (8,418) | (10,512) | (18,196)
Interest Rate Swaps |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities, beginning balance |  |  | 0
Derivative financial assets, beginning balance | 2,072 | 3,711 |
Derivative financial instrument (loss)/gain, net | 0 | 0 | 0
Gain/(Loss) on derivative financial instruments through OCI | 0 | 0 | 0
Gain/(Loss) on derivative financial instruments through finance costs | 71 | (186) | 3,461
Settlement of derivative financial instruments | (1,434) | (1,453) | 250
Derivative financial assets, ending balance | 709 | 2,072 | 3,711
Foreign Exchange Forwards Economic Hedge |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities, beginning balance |  |  | (3,727)
Derivative financial assets, beginning balance | 5,304 | 3,840 |
Derivative financial instrument (loss)/gain, net | (8,675) | 3,283 | (12,260)
Gain/(Loss) on derivative financial instruments through OCI | 0 | 0 | 0
Gain/(Loss) on derivative financial instruments through finance costs | 0 | 0 | 0
Settlement of derivative financial instruments | 2,357 | (1,819) | 19,827
Derivative financial liabilities, ending balance | (1,014) |  |
Derivative financial assets, ending balance |  | 5,304 | 3,840
Natural Gas Futures Cash Flow Hedge |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities, beginning balance |  | (2,930) | (1,228)
Derivative financial assets, beginning balance | 10 |  |
Derivative financial instrument (loss)/gain, net | 0 | 0 | 0
Gain/(Loss) on derivative financial instruments through OCI | (110) | (4,387) | 4,267
Gain/(Loss) on derivative financial instruments through finance costs | 0 | 0 | 0
Settlement of derivative financial instruments | 100 | 7,327 | (5,969)
Derivative financial liabilities, ending balance |  |  | $ (2,930)
Derivative financial assets, ending balance | $ 0 | $ 10 |

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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 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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