v3.19.3
Schedule Of Consolidated Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Pension Plan [Member]        
Components of net periodic benefit costs:        
Service cost $ 6,260 $ 6,424 $ 19,145 $ 28,393
Interest cost 3,026 2,816 9,136 12,054
Expected return on plan assets (2,354) (3,055) (7,045) (9,057)
Amortization of prior service credit (46) (45) (136) (136)
Amortization of actuarial loss 1,352 1,659 4,137 8,182
Settlement cost 439 0 2,499 0
Net periodic benefit cost 8,677 7,799 27,736 39,436
Other Postretirement Benefits Plan [Member]        
Components of net periodic benefit costs:        
Service cost 48 58 145 174
Interest cost 126 104 380 312
Expected return on plan assets 0 0 0 0
Amortization of prior service credit 0 0 0 0
Amortization of actuarial loss 60 147 248 441
Settlement cost 0 0 0 0
Net periodic benefit cost $ 234 $ 309 $ 773 $ 927