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Long-term debt - Schedule of Interest Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Debt Disclosure [Abstract]    
Long-term debt $ 261,535 $ 217,123
Commercial paper, credit facility draws and related fees 43,015 17,065
Accretion of fair value adjustments (16,547) (18,174)
Capitalized interest and AFUDC capitalized on regulated property (10,802) (6,521)
Other 1,373 61
Interest expense $ 278,574 $ 209,554