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Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net $ 5,232 $ 5,076 $ 15,832 $ 14,773
Interest cost on projected benefit obligations 1,391 2,102 4,201 6,227
Expected return on plan assets (10,345) (9,949) (31,208) (29,101)
Recognition of prior service cost (480) (1,837) (1,454) (5,335)
Recognition of actuarial losses/(gains) 6,929 6,583 20,914 19,170
Net periodic pension cost/(credit) 2,727 1,975 8,285 5,734
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net 374 326 1,122 978
Interest cost on projected benefit obligations 546 889 1,644 2,667
Expected return on plan assets (1,494) (1,523) (4,482) (4,571)
Recognition of prior service cost 0 0 0 0
Recognition of actuarial losses/(gains) 728 643 2,186 1,933
Net periodic pension cost/(credit) 154 335 470 1,007
Other Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net 4,858 4,750 14,710 13,795
Interest cost on projected benefit obligations 843 1,208 2,551 3,541
Expected return on plan assets (8,851) (8,426) (26,726) (24,530)
Recognition of prior service cost (462) (1,819) (1,398) (5,279)
Recognition of actuarial losses/(gains) 6,211 5,947 18,756 17,258
Net periodic pension cost/(credit) 2,599 1,660 7,893 4,785
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year, Description 27,900   27,900  
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost, net 0 0 0 0
Interest cost on projected benefit obligations 2 5 6 19
Expected return on plan assets 0 0 0 0
Recognition of prior service cost (18) (18) (56) (56)
Recognition of actuarial losses/(gains) (10) (7) (28) (21)
Net periodic pension cost/(credit) (26) $ (20) (78) $ (58)
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year, Description $ 200   $ 200