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Fair value measurement - Schedule of Changes in Fair Value of Pension Plan Assets and Liabilities, Categorized as Level 3 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Assets:    
Fair value of plan assets at beginning of period $ 1,785,367  
Fair value of plan assets at end of period 1,661,378 $ 1,785,367
Liabilities:    
Fair value of plan liabilities at beginning of year 1,469  
Fair value of plan liabilities at end of year 1,676 1,469
Other liabilities    
Liabilities:    
Fair value of plan liabilities at beginning of year 1,469  
Fair value of plan liabilities at end of year 1,676 1,469
Level 3    
Assets:    
Fair value of plan assets at beginning of period 352,130 361,833
Actual return on plan assets - Relating to assets still held at report date (12,083) 9,988
Actual return on plan assets - Relating to assets sold during the period 7 0
Purchases 39,243 30,727
Sales (30,573) (27,703)
Settlements (52,458) (22,715)
Fair value of plan assets at end of period 296,266 352,130
Liabilities:    
Fair value of plan liabilities at beginning of year 0  
Fair value of plan liabilities at end of year 0 0
Level 3 | Other liabilities    
Liabilities:    
Fair value of plan liabilities at beginning of year 0 2,008
Relating to assets still held at report date   0
Relating to assets sold/redeemed during the period   0
Purchases   0
Sales   0
Settlements   2,008
Fair value of plan liabilities at end of year 0 0
Real estate | Level 3    
Assets:    
Fair value of plan assets at beginning of period 133,503 132,593
Actual return on plan assets - Relating to assets still held at report date (2,039) 2,683
Actual return on plan assets - Relating to assets sold during the period 0 0
Purchases 0 13
Sales (6,674) (1,786)
Settlements 0 0
Fair value of plan assets at end of period 124,790 133,503
Partnership/joint venture interests | Level 3    
Assets:    
Fair value of plan assets at beginning of period 169,932 166,184
Actual return on plan assets - Relating to assets still held at report date (10,044) 4,164
Actual return on plan assets - Relating to assets sold during the period 0 0
Purchases 39,243 30,714
Sales (23,899) (25,917)
Settlements (3,756) (5,213)
Fair value of plan assets at end of period 171,476 169,932
Hedge funds | Level 3    
Assets:    
Fair value of plan assets at beginning of period 48,695 63,054
Actual return on plan assets - Relating to assets still held at report date 0 3,141
Actual return on plan assets - Relating to assets sold during the period 7 0
Purchases 0 0
Sales 0 0
Settlements (48,702) (17,500)
Fair value of plan assets at end of period 0 48,695
Other assets | Level 3    
Assets:    
Fair value of plan assets at beginning of period $ 0 2
Actual return on plan assets - Relating to assets still held at report date   0
Actual return on plan assets - Relating to assets sold during the period   0
Purchases   0
Sales   0
Settlements   (2)
Fair value of plan assets at end of period   $ 0