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Current and long-term debt - 2021 $146.3 million lease financing (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2023
USD ($)
Nov. 30, 2021
USD ($)
vessel
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Oct. 31, 2023
USD ($)
Jul. 31, 2023
Jan. 31, 2023
USD ($)
Disclosure of detailed information about borrowings [line items]                
Borrowings $ 1,588,290   $ 1,588,290 $ 1,436,224        
Principal repayments recognized in consolidated cash flow statements     516,127 $ 79,502 $ 56,729      
Purchase option fees           $ 1,700   $ 1,200
2021 $146.3 Million Lease Financing                
Disclosure of detailed information about borrowings [line items]                
Borrowings   $ 146,300            
Borrowings, bareboat charter term   7 years            
Principal repayments recognized in consolidated cash flow statements 120,500              
Purchase option fees $ 1,500   $ 1,500          
2021 $146.3 Million Lease Financing | Secured Overnight Financing Rate (SOFR)                
Disclosure of detailed information about borrowings [line items]                
Adjustment to interest rate basis             3.30%  
2021 $146.3 Million Lease Financing | STI Connaught, STI Winnie, STI Lauren and STI Broadway | Vessels | LR2                
Disclosure of detailed information about borrowings [line items]                
Number of vessels under finance lease arrangements | vessel   4            
2021 $146.3 Million Lease Financing | STI Rotherhithe and STI Hammersmith | Vessels | Handymax                
Disclosure of detailed information about borrowings [line items]                
Number of vessels under finance lease arrangements | vessel   2