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Long-term debt - Schedule of Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Debt Disclosure [Abstract] |  |  |  |
Long-term debt | $ 73,169 | $ 65,046 | $ 139,881 | $ 128,814
Commercial paper, credit facility draws and related fees | 39,299 | 27,714 | 82,412 | 52,140
Accretion of fair value adjustments | (5,094) | (824) | (10,956) | (4,223)
Capitalized interest and AFUDC capitalized on regulated property | (2,269) | (4,420) | (5,661) | (8,304)
Other | 682 | 2,147 | 2,635 | 3,154
Interest expense | $ 105,787 | $ 89,663 | $ 208,311 | $ 171,581

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