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Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net $ 5,156 $ 4,437 $ 14,778 $ 13,143
Interest cost on projected benefit obligations 5,148 5,702 14,935 16,947
Expected return on plan assets (12,825) (10,762) (36,897) (31,893)
Recognition of prior service cost (1,102) (1,185) (3,143) (3,504)
Recognition of actuarial losses/(gains) 5,250 4,311 15,064 12,767
Net periodic pension cost/(credit) 1,627 2,503 4,737 7,460
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net 233 397 699 1,191
Interest cost on projected benefit obligations 1,201 1,192 3,603 3,575
Expected return on plan assets (1,428) (1,368) (4,284) (4,104)
Recognition of prior service cost 0 0 0 0
Recognition of actuarial losses/(gains) 393 521 1,178 1,562
Net periodic pension cost/(credit) 399 742 1,196 2,224
Other Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net 4,923 4,040 14,079 11,952
Interest cost on projected benefit obligations 3,941 4,503 11,315 13,352
Expected return on plan assets (11,397) (9,394) (32,613) (27,789)
Recognition of prior service cost (1,083) (1,167) (3,087) (3,448)
Recognition of actuarial losses/(gains) 4,849 3,782 13,862 11,181
Net periodic pension cost/(credit) 1,233 1,764 3,556 5,248
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 7 17 20
Expected return on plan assets 0 0 0 0
Recognition of prior service cost (19) (18) (56) (56)
Recognition of actuarial losses/(gains) 8 8 24 24
Net periodic pension cost/(credit) $ (5) $ (3) $ (15) $ (12)