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Pension Plans And Other Postretirement Benefits (Components Of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 358 $ 400 $ 1,072 $ 1,201
Interest cost 3,908 4,309 11,724 12,926
Expected return on plan assets (4,696) (5,673) (14,088) (17,018)
Amortization of prior service cost 82 171 244 513
Amortization of actuarial (gain) loss 751 810 2,253 2,428
Net periodic benefit cost 403 17 1,205 50
Other Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 363 337 1,089 1,011
Interest cost 1,113 1,119 3,337 3,357
Expected return on plan assets (1,105) (1,093) (3,315) (3,279)
Amortization of actuarial (gain) loss (267) (329) (801) (988)
Net periodic benefit cost $ 104 $ 34 $ 310 $ 101