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Pension and Other Postretirement Employee Benefits (Components Of Net Periodic Cost (Benefit)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Pension Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2,045 $ 2,176 $ 4,090 $ 4,466
Interest cost 2,633 2,568 5,266 6,132
Expected return on plan assets (3,525) (3,151) (7,050) (7,737)
Amortization of prior service cost (credit) 21 28 42 56
Amortization of actuarial loss 3,578 3,559 7,299 7,713
Net periodic cost before pension settlement charge     9,647 10,630
Pension settlement charge       42,988
Total net periodic cost 4,752 5,180 9,647 53,618
OPEB [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 168 112 336 254
Interest cost 317 376 634 751
Amortization of prior service cost (credit) (298) (319) (596) (638)
Amortization of actuarial loss 545 417 1,090 836
Net periodic cost before pension settlement charge     1,464 1,203
Total net periodic cost $ 732 $ 586 $ 1,464 $ 1,203