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Long-term debt - Schedule of Interest Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Debt Disclosure [Abstract] |  |
Long-term debt | $ 293,544 | $ 217,672
Commercial paper, credit facility draws and related fees | 100,386 | 119,868
Accretion of fair value adjustments | (23,000) | (21,968)
AFUDC capitalized on regulated property | (4,604) | (9,440)
Other | (2,750) | 2,308
Interest expense | $ 363,576 | $ 308,440

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