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Financial instruments - Fair value - Level 2 instruments, narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [line items]    
Financial assets $ 1,130,036 $ 1,694,248
Financial assets measured at fair value: | Derivative instruments | Cash flow hedges    
Disclosure of financial assets [line items]    
Financial assets 121,108 322,748
Financial assets measured at fair value: | Derivative instruments | Cash flow hedges | Level 2    
Disclosure of financial assets [line items]    
Financial assets $ 121,100 $ 322,700