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Current and long-term debt - Prudential Private Capital facility (Details)
 1 Months Ended
Nov. 30, 2019
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Disclosure of detailed information about borrowings [line items]      
Borrowings   $ 1,588,290,000 $ 1,436,224,000
Gross carrying amount      
Disclosure of detailed information about borrowings [line items]      
Borrowings   1,617,439,000 1,948,592,000
Prudential Credit Facility      
Disclosure of detailed information about borrowings [line items]      
Loan maximum borrowing capacity $ 55,500,000    
Adjustment to interest rate basis 3.00%    
Net debt to capitalization ratio 0.60    
Consolidated tangible net worth $ 1,000,000,000    
Cumulative positive net income 25.00%    
Net proceeds of equity issuance 50.00%    
Prudential Credit Facility | Gross carrying amount      
Disclosure of detailed information about borrowings [line items]      
Borrowings   $ 33,740,000 $ 39,286,000
Consolidated Liquidity Requirement - Scenario One | Prudential Credit Facility      
Disclosure of detailed information about borrowings [line items]      
Covenant liquidity requirement amount $ 25,000,000    
Consolidated Liquidity Requirement - Scenario Two | Prudential Credit Facility      
Disclosure of detailed information about borrowings [line items]      
Consolidated liquidity requirement per each owned vessel 500,000    
Consolidated liquidity requirement per each chartered-in vessel $ 250,000    
Borrowings, Financial Covenants, Period One | Prudential Credit Facility      
Disclosure of detailed information about borrowings [line items]      
Minimum ratio for fair value of vessels 125.00%