v3.20.2
Schedule Of Consolidated Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension Plan [Member]        
Components of net periodic benefit costs:        
Service cost $ 6,735 $ 6,358 $ 13,938 $ 12,885
Interest cost 2,711 3,110 5,513 6,110
Expected return on plan assets (2,809) (2,317) (5,695) (4,691)
Amortization of prior service credit (45) (45) (90) (90)
Amortization of actuarial loss 1,322 1,508 2,734 2,785
Settlement cost 0 2,060 969 2,060
Settlement gain on disposition of assets     (1,342) 0
Net periodic benefit cost 7,914 10,674 16,027 19,059
Other Postretirement Benefits Plan [Member]        
Components of net periodic benefit costs:        
Service cost 67 43 129 97
Interest cost 127 135 239 254
Expected return on plan assets 0 0 0 0
Amortization of prior service credit 0 0 0 0
Amortization of actuarial loss 136 117 255 188
Settlement cost 0 0 0 0
Settlement gain on disposition of assets     0 0
Net periodic benefit cost $ 330 $ 295 $ 623 $ 539