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Pension and Other Postretirement Employee Benefits (Components Of Net Periodic Cost (Benefit)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Pension Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2,045 $ 2,233 $ 6,135 $ 6,699
Interest cost 2,633 3,066 7,899 9,198
Expected return on plan assets (3,525) (3,869) (10,575) (11,606)
Amortization of prior service cost (credit) 21 29 63 85
Amortization of actuarial loss 3,578 3,856 10,877 11,569
Net periodic cost before pension settlement charge     14,399 15,945
Pension settlement charge       42,988
Total net periodic cost 4,752 5,315 14,399 58,933
OPEB [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 168 127 504 381
Interest cost 317 376 951 1,127
Amortization of prior service cost (credit) (298) (319) (894) (957)
Amortization of actuarial loss 545 418 1,635 1,254
Net periodic cost before pension settlement charge     2,196 1,805
Total net periodic cost $ 732 $ 602 $ 2,196 $ 1,805