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Current and long-term debt - 2023 $49.1 million credit facility (Details)
 1 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
tanker
Feb. 28, 2023
USD ($)
Dec. 31, 2023
USD ($)
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 $49.1 Million Credit Facility        
Disclosure of detailed information about borrowings [line items]        
Loan maximum borrowing capacity   $ 49,100,000    
Borrowings instrument, term   5 years    
Periodic borrowing payment amount   $ 1,200,000    
Net debt to capitalization ratio   0.65    
Consolidated tangible net worth   $ 1,600,000,000    
Cumulative positive net income   25.00%    
Net proceeds of equity issuance   50.00%    
Minimum ratio for fair value of vessels   150.00%    
2023 $49.1 Million Credit Facility | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Drawdowns     49,088,000  
Borrowings     $ 45,626,000 $ 0
2023 $49.1 Million Credit Facility | Consolidated Liquidity Requirement - Scenario One        
Disclosure of detailed information about borrowings [line items]        
Covenant liquidity requirement amount   $ 25,000,000    
2023 $49.1 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 $49.1 Million Credit Facility | Secured Overnight Financing Rate (SOFR)        
Disclosure of detailed information about borrowings [line items]        
Adjustment to interest rate basis   1.90%    
2023 $49.1 Million Credit Facility | STI Rose and STI Rambla | LR2        
Disclosure of detailed information about borrowings [line items]        
Drawdowns $ 49,100,000      
Number of vessels | tanker 2