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Pension Plan and Other Postretirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Pension Plan        
Pension Plan and Other Postretirement Benefits        
Employer cash contributions     $ 14,100 $ 16,800
Estimated cash contributions in the current fiscal year $ 23,500   23,500  
Components of the pension plans and other postretirement benefits        
Service cost 9,010 $ 8,811 18,020 17,622
Interest cost 5,319 6,433 10,638 12,866
Expected return on plan assets (9,866) (8,265) (19,732) (16,530)
Amortization of prior service cost 253 1,057 506 2,114
Recognized net actuarial loss 1,924 3,196 3,848 6,392
Net periodic benefit cost 6,640 11,232 13,280 22,464
Other Benefits        
Pension Plan and Other Postretirement Benefits        
Employer cash contributions     1,500 3,900
Estimated cash contributions in the current fiscal year 2,200   2,200  
Components of the pension plans and other postretirement benefits        
Service cost 1,611 2,106 3,222 4,212
Interest cost 805 1,210 1,611 2,420
Expected return on plan assets (2,192) (1,811) (4,383) (3,622)
Amortization of prior service cost 49 49 97 98
Recognized net actuarial loss (110) 14 (220) 28
Net periodic benefit cost $ 163 $ 1,568 $ 327 $ 3,136