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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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