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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

X
- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, measured using unobservable input, of decrease in plan asset of defined benefit plan from sale. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(B) -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, measured using unobservable input, of increase in plan asset of defined benefit plan from purchase. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(B) -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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