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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