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Financial instruments and derivatives - Carrying Amounts and Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Carrying Amount    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Long-term debt, net of current portion $ 4,985,496 $ 2,998,002
Fair Value    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Long-term debt, net of current portion $ 4,800,455 $ 2,852,143