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Current and long-term debt - AVIC lease financing (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2023
USD ($)
Sep. 30, 2022
vessel
Feb. 28, 2022
USD ($)
Dec. 31, 2020
USD ($)
vessel
Jul. 31, 2018
USD ($)
tanker
Sep. 30, 2018
Dec. 31, 2023
USD ($)
vessel
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Oct. 31, 2023
USD ($)
Disclosure of detailed information about borrowings [line items]                    
Borrowings             $ 1,588,290 $ 1,436,224    
Principal repayments recognized in consolidated cash flow statements             $ 516,127 79,502 $ 56,729  
Number of vessels, purchase option exercised | vessel             18      
Purchase option fees $ 1,200                 $ 1,700
Gross carrying amount                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings             $ 1,617,439 1,948,592    
Top of range                    
Disclosure of detailed information about borrowings [line items]                    
Adjustment to interest rate basis             0.26161%      
AVIC Lease Financing                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings         $ 145,000          
Principal repayments recognized in consolidated cash flow statements $ 77,800                  
Number of vessels, purchase option exercised | vessel   4                
Borrowings, bareboat charter term           8 years        
AVIC Lease Financing | Gross carrying amount                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings             $ 0 $ 77,769    
AVIC Lease Financing | STI Fontvieille | Gross carrying amount                    
Disclosure of detailed information about borrowings [line items]                    
Principal repayments recognized in consolidated cash flow statements     $ 17,200              
AVIC Lease Financing | Top of range                    
Disclosure of detailed information about borrowings [line items]                    
Sale leaseback, option to purchase period         8 years          
AVIC Lease Financing | London Interbank Offered Rate (LIBOR)                    
Disclosure of detailed information about borrowings [line items]                    
Adjustment to interest rate basis       4.20% 3.70%          
Vessels | MR | AVIC Lease Financing | STI Ville, STI Fontvieille and STI Brooklyn                    
Disclosure of detailed information about borrowings [line items]                    
Number of vessels under finance lease arrangements | tanker         3          
Borrowings         $ 24,000          
Vessels | LR2 | AVIC Lease Financing | STI Rose and STI Rambla                    
Disclosure of detailed information about borrowings [line items]                    
Number of vessels under finance lease arrangements | tanker         2          
Borrowings         $ 36,500          
Installation of scrubbers | AVIC Lease Financing                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings       $ 4,600            
Sale leaseback transaction, term       3 years            
Installation of scrubbers | Vessels | AVIC Lease Financing                    
Disclosure of detailed information about borrowings [line items]                    
Number of vessels under finance lease arrangements | vessel       3