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Long-term debt - Schedule of Interest Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Debt Disclosure [Abstract]    
Long-term debt $ 251,539 $ 258,084
Commercial paper, credit facility draws and related fees 134,678 46,466
Accretion of fair value adjustments (23,834) (16,547)
Capitalized interest and AFUDC capitalized on regulated property (14,679) (10,802)
Other 5,952 1,373
Interest expense $ 353,656 $ 278,574