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Financial instruments - Bank Borrowings, Non-Current (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Financial instruments [Line Items] |  |
Notional amount | $ 50,707 | $ 345,949
Bond issuance costs | (3,708) | (2,360)
Unsecured obligations |  |
Financial instruments [Line Items] |  |
Notional amount | 300,000 | 200,000
Carrying amount | 300,000 | 200,000
Bond issuance costs | (4,482) | (2,478)
Total | 295,518 | 197,522
Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 | 0
Carrying amount | 0 | 0
Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 200,000 | 200,000
Carrying amount | 200,000 | 200,000
Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 100,000 | 0
Carrying amount | $ 100,000 | $ 0
Bank of Nova Scotia |  |
Financial instruments [Line Items] |  |
Effective rate | 5.88% |
Nominal rate | 6.64% |
Bank of Nova Scotia | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Notional amount | $ 200,000 |
Carrying amount | 200,000 |
Bond issuance costs | (1,648) |
Total | 198,352 |
Bank of Nova Scotia | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 |
Carrying amount | 0 |
Bank of Nova Scotia | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 200,000 |
Carrying amount | 200,000 |
Bank of Nova Scotia | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 |
Carrying amount | $ 0 |
Banco Santander/Kexim |  |
Financial instruments [Line Items] |  |
Effective rate | 5.49% |
Nominal rate | 6.36% |
Banco Santander/Kexim | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Notional amount | $ 100,000 |
Carrying amount | 100,000 |
Bond issuance costs | (2,834) |
Total | 97,166 |
Banco Santander/Kexim | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 |
Carrying amount | 0 |
Banco Santander/Kexim | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount | 0 |
Carrying amount | 0 |
Banco Santander/Kexim | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount | 100,000 |
Carrying amount | $ 100,000 |
Scotiabank Cayman |  |
Financial instruments [Line Items] |  |
Effective rate |  | 2.33%
Nominal rate |  | 3.19%
Scotiabank Cayman | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Notional amount |  | $ 0
Carrying amount |  | 0
Bond issuance costs |  | 0
Total |  | 0
Scotiabank Cayman | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount |  | 0
Carrying amount |  | 0
Scotiabank Cayman | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount |  | 0
Carrying amount |  | 0
Scotiabank Cayman | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount |  | 0
Carrying amount |  | $ 0
Scotiabank |  |
Financial instruments [Line Items] |  |
Effective rate |  | 5.10%
Nominal rate |  | 6.08%
Scotiabank | Unsecured obligations |  |
Financial instruments [Line Items] |  |
Notional amount |  | $ 200,000
Carrying amount |  | 200,000
Bond issuance costs |  | (2,478)
Total |  | 197,522
Scotiabank | Unsecured obligations | Over 1 year to 2 years |  |
Financial instruments [Line Items] |  |
Notional amount |  | 0
Carrying amount |  | 0
Scotiabank | Unsecured obligations | Over 2 years to 3 years |  |
Financial instruments [Line Items] |  |
Notional amount |  | 200,000
Carrying amount |  | 200,000
Scotiabank | Unsecured obligations | Over 3 years to 4 years |  |
Financial instruments [Line Items] |  |
Notional amount |  | 0
Carrying amount |  | $ 0

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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The non-current portion of non-current bonds issued. [Refer: Bonds issued] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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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 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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