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Long-term debt - Schedule of Interest Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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