v3.19.1
Schedule Of Consolidated Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Pension Plan [Member]    
Components of net periodic benefit costs:    
Service cost $ 6,527 $ 15,700
Interest cost 3,000 6,443
Expected return on plan assets (2,374) (2,978)
Amortization of prior service credit (45) (45)
Amortization of actuarial loss 1,277 4,954
Net periodic benefit cost 8,385 24,074
Other Postretirement Benefits Plan [Member]    
Components of net periodic benefit costs:    
Service cost 54 65
Interest cost 119 106
Expected return on plan assets 0 0
Amortization of prior service credit 0 0
Amortization of actuarial loss 71 160
Net periodic benefit cost $ 244 $ 331