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Pension and postretirement benefits - Components of net periodic benefit cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Pension Plans |  |  |  |
Personnel costs: |  |  |  |
Service cost | $ 0 | $ 0 | $ 0 | $ 0
Other operating expenses |  |  |  |
Interest cost | 7,558 | 7,886 | 22,675 | 23,661
Expected return on plan assets | (8,594) | (8,591) | (25,782) | (25,774)
Amortization of prior service cost/(credit) | 0 | 0 | 0 | 0
Amortization of net loss | 4,166 | 5,367 | 12,498 | 16,099
Total net periodic pension cost | 3,130 | 4,662 | 9,391 | 13,986
OPEB Plan |  |  |  |
Personnel costs: |  |  |  |
Service cost | 32 | 48 | 95 | 143
Other operating expenses |  |  |  |
Interest cost | 1,421 | 1,520 | 4,264 | 4,561
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of prior service cost/(credit) | 0 | 0 | 0 | 0
Amortization of net loss | (548) | (553) | (1,644) | (1,659)
Total net periodic pension cost | $ 905 | $ 1,015 | $ 2,715 | $ 3,045

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