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Long-term debt - Schedule of Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Debt Disclosure [Abstract]        
Long-term debt $ 73,169 $ 65,046 $ 139,881 $ 128,814
Commercial paper, credit facility draws and related fees 39,299 27,714 82,412 52,140
Accretion of fair value adjustments (5,094) (824) (10,956) (4,223)
Capitalized interest and AFUDC capitalized on regulated property (2,269) (4,420) (5,661) (8,304)
Other 682 2,147 2,635 3,154
Interest expense $ 105,787 $ 89,663 $ 208,311 $ 171,581