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Current and long-term debt - 2022 AVIC lease financing (Details) | 1 Months Ended | 2 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) vessel | May 31, 2022 | Jun. 30, 2022 USD ($) vessel | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings |  |  |  | $ 1,588,290,000 | $ 1,436,224,000
Deposit held by lessor |  |  |  | 0 | 11,430,000
2022 AVIC Lease Financing |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Net debt to capitalization ratio |  |  | 0.70 |  |
Consolidated tangible net worth |  |  | $ 650,000,000 |  |
Minimum ratio for fair value of vessels |  | 110.00% |  |  |
Deposit held by lessor |  |  |  | $ 1,200,000 | $ 1,200,000
2022 AVIC Lease Financing | Vessels |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings | $ 118,400,000 |  | 118,400,000 |  |
Repayments |  |  | $ 90,200,000 |  |
2022 AVIC Lease Financing | Vessels | MR and LR2 | London Interbank Offered Rate LIBOR plus margin |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Adjustment to interest rate basis | 3.50% |  | 3.50% |  |
STI Gramercy and STI Queens | 2022 AVIC Lease Financing | Vessels | MR |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Number of vessels under finance lease arrangements | vessel | 2 |  | 2 |  |
STI Selatar and STI Oxford | 2022 AVIC Lease Financing | Vessels | LR2 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Number of vessels under finance lease arrangements | vessel | 2 |  | 2 |  |
STI Gramercy, STI Queens, STI Selatar and STI Oxford | 2022 AVIC Lease Financing |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings, bareboat charter term |  |  | 9 years |  |
Periodic borrowing payment amount | $ 2,300,000 |  |  |  |
STI Gramercy, STI Queens, STI Selatar and STI Oxford | 2022 AVIC Lease Financing | Vessels |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Lease deposit, percent of borrowing amount | 1.00% |  | 1.00% |  |
Lease deposit, aggregate amount | $ 1,200,000 |  | $ 1,200,000 |  |

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