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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)