Pension and Other Postretirement Employee Benefits (Components Of Net Periodic Cost (Benefit)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,322	$ 1,355	$ 2,643	$ 2,711
Interest cost	3,122	3,137	6,245	6,275
Expected return on plan assets	(3,237)	(3,025)	(6,474)	(6,053)
Amortization of prior service cost	5	11	10	22
Amortization of actuarial (gain) loss	20	(21)	40	(42)
Total net periodic cost	1,232	1,457	2,464	2,913
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	24	28	47	55
Interest cost	219	293	438	587
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of actuarial (gain) loss	(330)	(166)	(661)	(332)
Total net periodic cost	$ (87)	$ 155	$ (176)	$ 310