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Pension and Other Postretirement Employee Benefits (Components Of Net Periodic Cost (Benefit)) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1,321 $ 1,356
Interest cost 3,123 3,138
Expected return on plan assets (3,237) (3,028)
Amortization of prior service cost 5 11
Amortization of actuarial (gain) loss 20 (21)
Total net periodic cost 1,232 1,456
OPEB [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 23 27
Interest cost 219 294
Expected return on plan assets 0 0
Amortization of prior service cost 0 0
Amortization of actuarial (gain) loss (331) (166)
Total net periodic cost $ (89) $ 155