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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, 2025
Mar. 31, 2024
Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1,266 $ 1,321
Interest cost 3,228 3,123
Expected return on plan assets (2,932) (3,237)
Amortization of prior service cost 0 5
Amortization of actuarial (gain) loss 43 20
Total net periodic cost 1,605 1,232
OPEB [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 14 23
Interest cost 252 219
Expected return on plan assets 0 0
Amortization of prior service cost 0 0
Amortization of actuarial (gain) loss (240) (331)
Total net periodic cost $ 26 $ (89)