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Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost, net | $ 4,289 | $ 3,714 | $ 8,706 | $ 7,400
Interest cost on projected benefit obligations | 5,567 | 6,180 | 11,245 | 12,318
Expected return on plan assets | (10,418) | (10,028) | (21,131) | (19,978)
Recognition of prior service cost | (1,139) | (1,079) | (2,319) | (2,148)
Recognition of actuarial losses/(gains) | 4,166 | 3,108 | 8,456 | 6,193
Net periodic pension cost/(credit) | 2,465 | 1,895 | 4,957 | 3,785
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost, net | 397 | 289 | 794 | 579
Interest cost on projected benefit obligations | 1,191 | 1,256 | 2,383 | 2,511
Expected return on plan assets | (1,368) | (1,383) | (2,736) | (2,766)
Recognition of prior service cost | 0 | 0 | 0 | 0
Recognition of actuarial losses/(gains) | 520 | 548 | 1,041 | 1,096
Net periodic pension cost/(credit) | 740 | 710 | 1,482 | 1,420
Other Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost, net | 3,892 | 3,425 | 7,912 | 6,821
Interest cost on projected benefit obligations | 4,370 | 4,916 | 8,849 | 9,792
Expected return on plan assets | (9,050) | (8,645) | (18,395) | (17,212)
Recognition of prior service cost | (1,120) | (1,060) | (2,281) | (2,110)
Recognition of actuarial losses/(gains) | 3,638 | 2,561 | 7,399 | 5,098
Net periodic pension cost/(credit) | 1,730 | 1,197 | 3,484 | 2,389
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year, Description | 27,300 |  | 27,300 |
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost, net | 0 | 0 | 0 | 0
Interest cost on projected benefit obligations | 6 | 8 | 13 | 15
Expected return on plan assets | 0 | 0 | 0 | 0
Recognition of prior service cost | (19) | (19) | (38) | (38)
Recognition of actuarial losses/(gains) | 8 | (1) | 16 | (1)
Net periodic pension cost/(credit) | $ (5) | $ (12) | $ (9) | $ (24)

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + 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 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(5) -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 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + 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 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(3) -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 6 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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