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Current and long-term debt - 2023 $225 million credit facility (Details)
 1 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
tanker
Feb. 28, 2023
USD ($)
Jan. 31, 2023
USD ($)
tanker
Dec. 31, 2023
USD ($)
vessel
Dec. 31, 2022
USD ($)
Disclosure of detailed information about borrowings [line items]          
Number of vessels | vessel       1  
Borrowings       $ 1,588,290,000 $ 1,436,224,000
Gross carrying amount          
Disclosure of detailed information about borrowings [line items]          
Drawdowns       1,386,482,000  
Borrowings       1,617,439,000 1,948,592,000
2023 $225.0 Million Credit Facility          
Disclosure of detailed information about borrowings [line items]          
Borrowings instrument, term     5 years    
Net debt to capitalization ratio     0.65    
Consolidated tangible net worth     $ 1,500,000,000    
Minimum ratio for fair value of vessels     140.00%    
2023 $225.0 Million Credit Facility | Gross carrying amount          
Disclosure of detailed information about borrowings [line items]          
Drawdowns       225,000,000  
Borrowings       $ 199,575,000 $ 0
2023 $225.0 Million Credit Facility | Consolidated Liquidity Requirement - Scenario One          
Disclosure of detailed information about borrowings [line items]          
Covenant liquidity requirement amount     $ 25,000,000    
2023 $225.0 Million Credit Facility | Consolidated Liquidity Requirement - Scenario Two          
Disclosure of detailed information about borrowings [line items]          
Liquidity requirement, per each owned ship     500,000    
Liquidity requirement, per each chartered-in ship     $ 250,000    
2023 $225.0 Million Credit Facility | MR          
Disclosure of detailed information about borrowings [line items]          
Number of vessels | tanker     11    
2023 $225.0 Million Credit Facility | MR | Repayment Period One          
Disclosure of detailed information about borrowings [line items]          
Periodic payment per vessel     $ 630,000    
Repayment term     2 years    
2023 $225.0 Million Credit Facility | MR | Repayment Period Two          
Disclosure of detailed information about borrowings [line items]          
Periodic payment per vessel     $ 330,000    
2023 $225.0 Million Credit Facility | LR2          
Disclosure of detailed information about borrowings [line items]          
Number of vessels | tanker     2    
2023 $225.0 Million Credit Facility | LR2 | Repayment Period One          
Disclosure of detailed information about borrowings [line items]          
Periodic payment per vessel     $ 800,000    
Repayment term     2 years    
2023 $225.0 Million Credit Facility | LR2 | Repayment Period Two          
Disclosure of detailed information about borrowings [line items]          
Periodic payment per vessel     $ 450,000    
2023 $225.0 Million Credit Facility | Secured Overnight Financing Rate (SOFR)          
Disclosure of detailed information about borrowings [line items]          
Adjustment to interest rate basis     1.975%    
Thirteen Product Tankers | 2023 $225.0 Million Credit Facility          
Disclosure of detailed information about borrowings [line items]          
Loan maximum borrowing capacity     $ 225,000,000.0    
Drawdowns $ 40,100,000 $ 184,900,000      
Number of vessels | tanker 13