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Pension Plan and Other Postretirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Pension Plan        
Pension Plan and Other Postretirement Benefits        
Employer cash contributions     $ 18,900 $ 25,800
Estimated cash contributions in the current fiscal year $ 23,500   23,500  
Components of the pension plans and other postretirement benefits        
Service cost 8,308 $ 9,378 26,329 27,002
Interest cost 5,608 6,440 16,245 19,306
Expected return on plan assets (9,873) (8,284) (29,605) (24,815)
Amortization of prior service cost 248 1,058 755 3,172
Recognized net actuarial loss 2,881 3,208 6,729 9,599
Net periodic benefit cost 7,172 11,800 20,453 34,264
Other Benefits        
Pension Plan and Other Postretirement Benefits        
Employer cash contributions     1,900 5,700
Estimated cash contributions in the current fiscal year 2,200   2,200  
Components of the pension plans and other postretirement benefits        
Service cost 1,332 1,746 4,554 5,959
Interest cost 802 808 2,413 3,229
Expected return on plan assets (2,194) (1,804) (6,577) (5,427)
Amortization of prior service cost 48 50 145 148
Recognized net actuarial loss (145) (27) (365) 0
Net periodic benefit cost $ (157) $ 773 $ 170 $ 3,909