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Pension Plan and Other Postretirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Pension Plan    
Pension Plan and Other Postretirement Benefits    
Employer cash contributions $ 9,400 $ 7,900
Estimated cash contributions in the current fiscal year 23,500  
Components of the pension plans and other postretirement benefits    
Service cost 9,010 8,811
Interest cost 5,319 6,433
Expected return on plan assets (9,866) (8,265)
Amortization of prior service cost 253 1,057
Recognized net actuarial loss 1,924 3,196
Net periodic benefit cost 6,640 11,232
Other Benefits    
Pension Plan and Other Postretirement Benefits    
Employer cash contributions 1,200 2,200
Estimated cash contributions in the current fiscal year 2,200  
Components of the pension plans and other postretirement benefits    
Service cost 1,611 2,106
Interest cost 805 1,210
Expected return on plan assets (2,192) (1,811)
Amortization of prior service cost 49 49
Recognized net actuarial loss (110) 14
Net periodic benefit cost $ 163 $ 1,568