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Pension Plan and Other Postretirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension Plan        
Pension Plan and Other Postretirement Benefits        
Employer cash contributions     $ 16,800 $ 6,300
Estimated cash contributions in the current fiscal year $ 38,000   38,000  
Components of the pension plans and other postretirement benefits        
Service cost 8,811 $ 6,565 17,622 13,129
Interest cost 6,433 6,642 12,866 13,284
Expected return on plan assets (8,265) (7,567) (16,530) (15,133)
Amortization of prior service cost 1,057 1,262 2,114 2,524
Recognized net actuarial loss 3,196 1,312 6,392 2,624
Net periodic benefit cost 11,232 8,214 22,464 16,428
Other Benefits        
Pension Plan and Other Postretirement Benefits        
Employer cash contributions     3,900 3,400
Estimated cash contributions in the current fiscal year 7,500   7,500  
Components of the pension plans and other postretirement benefits        
Service cost 2,106 1,762 4,212 3,524
Interest cost 1,210 1,337 2,420 2,674
Expected return on plan assets (1,811) (1,435) (3,622) (2,871)
Amortization of prior service cost 49 49 98 99
Recognized net actuarial loss 14 104 28 207
Net periodic benefit cost $ 1,568 $ 1,817 $ 3,136 $ 3,633