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Pension Plan and Other Postretirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Pension Plan        
Pension Plan and Other Postretirement Benefits        
Employer cash contributions     $ 25,800 $ 12,500
Estimated cash contributions in the current fiscal year $ 38,000   38,000  
Components of the pension plans and other postretirement benefits        
Service cost 9,378 $ 6,910 27,002 20,039
Interest cost 6,440 6,941 19,306 20,225
Expected return on plan assets (8,284) (7,581) (24,815) (22,714)
Amortization of prior service cost 1,058 1,262 3,172 3,786
Recognized net actuarial loss 3,208 1,821 9,599 4,445
Net periodic benefit cost 11,800 9,353 34,264 25,781
Other Benefits        
Pension Plan and Other Postretirement Benefits        
Employer cash contributions     5,700 5,600
Estimated cash contributions in the current fiscal year 7,500   7,500  
Components of the pension plans and other postretirement benefits        
Service cost 1,746 2,082 5,959 5,606
Interest cost 808 1,407 3,229 4,081
Expected return on plan assets (1,804) (1,475) (5,427) (4,346)
Amortization of prior service cost 50 49 148 148
Recognized net actuarial loss (27) 214 0 421
Net periodic benefit cost $ 773 $ 2,277 $ 3,909 $ 5,910