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Employee benefit plans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Supplemental employee retirement plans |  |  |  |
Defined benefit plan disclosure, net periodic benefit cost [Line Items] |  |  |  |
Net periodic benefit cost (credit) | $ 733 | $ 750 | $ 1,500 | $ 1,500

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