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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pension Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,321 $ 1,355 $ 3,964 $ 4,066
Interest cost 3,124 3,139 9,369 9,414
Expected return on plan assets (3,237) (3,028) (9,711) (9,081)
Amortization of prior service cost 5 10 15 32
Amortization of actuarial (gain) loss 19 (21) 59 (63)
Total net periodic cost 1,232 1,455 3,696 4,368
OPEB [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 22 27 69 82
Interest cost 220 294 658 881
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Amortization of actuarial (gain) loss (331) (166) (992) (498)
Total net periodic cost $ (89) $ 155 $ (265) $ 465