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Fair value measurement - Schedule of Fair Value of Pension Plan Assets by Level Within Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | $ 1,661,378 | $ 1,785,367 |
Liabilities | (1,676) | (1,469) |
Other liabilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Liabilities | (1,676) | (1,469) |
Total |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 1,627,726 | 1,749,182 |
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 121,359 | 153,647 |
Liabilities | (1,676) | (1,469) |
Level 1 | Other liabilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Liabilities | (1,676) | (1,469) |
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 1,210,101 | 1,243,405 |
Liabilities | 0 | 0 |
Level 2 | Other liabilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Liabilities | 0 | 0 |
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 296,266 | 352,130 | $ 361,833
Liabilities | 0 | 0 |
Level 3 | Other liabilities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Liabilities | 0 | 0 | (2,008)
Cash and cash equivalents | Total |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 12,684 | 13,423 |
Cash and cash equivalents | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 10,989 | 11,524 |
Cash and cash equivalents | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 1,695 | 1,899 |
Cash and cash equivalents | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Corporate common stock | Total |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 66,725 | 98,309 |
Corporate common stock | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 66,725 | 98,309 |
Corporate common stock | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Corporate common stock | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Corporate and government bonds | Total |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 231,518 | 253,403 |
Corporate and government bonds | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Corporate and government bonds | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 231,518 | 253,403 |
Corporate and government bonds | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Real estate | Total |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 124,790 | 133,503 |
Real estate | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Real estate | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Real estate | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 124,790 | 133,503 | 132,593
Real estate | Instruments measured at NAV using the practical expedient: |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 8,814 | 9,576 |
Mutual funds | Total |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 20,430 | 22,764 |
Mutual funds | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 20,430 | 22,764 |
Mutual funds | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Mutual funds | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Exchange traded funds | Total |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 23,215 | 21,050 |
Exchange traded funds | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 23,215 | 21,050 |
Exchange traded funds | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Exchange traded funds | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Equities | Total |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 255,382 | 296,624 |
Equities | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Equities | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 255,382 | 296,624 |
Equities | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Fixed income | Total |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 721,506 | 691,479 |
Fixed income | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Fixed income | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 721,506 | 691,479 |
Fixed income | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Fixed income | Instruments measured at NAV using the practical expedient: |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 23,163 | 23,396 |
Partnership/joint venture interests | Total |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 171,476 | 169,932 |
Partnership/joint venture interests | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Partnership/joint venture interests | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 0 | 0 |
Partnership/joint venture interests | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 171,476 | 169,932 | 166,184
Partnership/joint venture interests | Instruments measured at NAV using the practical expedient: |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | 1,675 | 3,213 |
Hedge funds | Total |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets |  | 48,695 |
Hedge funds | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets |  | 0 |
Hedge funds | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets |  | 0 |
Hedge funds | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets | $ 0 | $ 48,695 | $ 63,054

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