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Fair value measurements - Fair Value, by Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
--- | --- | --- | ---
Fair value, balance sheet grouping [Line Items] |  |  |
Long-term debt | $ 2,400,617 | $ 2,298,223 | $ 2,247,422
Carrying amount |  |  |
Fair value, balance sheet grouping [Line Items] |  |  |
Long-term debt | 2,400,617 | 2,298,223 | 2,247,422
Fair value |  |  |
Fair value, balance sheet grouping [Line Items] |  |  |
Long-term debt, fair value | $ 2,087,677 | $ 2,046,039 | $ 1,949,905

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