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Long-term debt - Schedule of Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Debt Disclosure [Abstract]        
Long-term debt $ 65,046 $ 65,746 $ 128,814 $ 127,832
Commercial paper, credit facility draws and related fees 27,714 5,466 52,139 9,051
Accretion of fair value adjustments (824) (4,471) (4,223) (9,014)
Capitalized interest and AFUDC capitalized on regulated property (4,420) (906) (8,304) (2,136)
Other 2,147 (1,262) 3,155 (3,217)
Interest expense $ 89,663 $ 64,573 $ 171,581 $ 122,516