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Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net $ 4,894 $ 4,289 $ 9,622 $ 8,706
Interest cost on projected benefit obligations 5,030 5,567 9,788 11,245
Expected return on plan assets (12,457) (10,418) (24,072) (21,131)
Recognition of prior service cost (1,064) (1,139) (2,042) (2,319)
Recognition of actuarial losses/(gains) 5,090 4,166 9,815 8,456
Net periodic pension cost/(credit) 1,493 2,465 3,111 4,957
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net 233 397 466 794
Interest cost on projected benefit obligations 1,201 1,191 2,402 2,383
Expected return on plan assets (1,428) (1,368) (2,856) (2,736)
Recognition of prior service cost 0 0 0 0
Recognition of actuarial losses/(gains) 393 520 786 1,041
Net periodic pension cost/(credit) 399 740 798 1,482
Other Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net 4,661 3,892 9,156 7,912
Interest cost on projected benefit obligations 3,823 4,370 7,374 8,849
Expected return on plan assets (11,029) (9,050) (21,216) (18,395)
Recognition of prior service cost (1,045) (1,120) (2,004) (2,281)
Recognition of actuarial losses/(gains) 4,689 3,638 9,013 7,399
Net periodic pension cost/(credit) 1,099 1,730 2,323 3,484
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year, Description 25,400   25,400  
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 6 12 13
Expected return on plan assets 0 0 0 0
Recognition of prior service cost (19) (19) (38) (38)
Recognition of actuarial losses/(gains) 8 8 16 16
Net periodic pension cost/(credit) $ (5) $ (5) $ (10) $ (9)