Pension and Other Postretirement Employee Benefits (Components Of Net Periodic Cost (Benefit)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,355	$ 1,652	$ 2,711	$ 3,501
Interest cost	3,137	2,611	6,275	5,423
Expected return on plan assets	(3,025)	(2,258)	(6,053)	(5,403)
Amortization of prior service cost	11	18	22	36
Amortization of actuarial (gain) loss	(21)	1,148	(42)	3,102
Net periodic cost before pension settlement charge			2,913	6,659
Pension settlement charge			0	14,165
Total net periodic cost	1,457	3,171	2,913	20,824
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	28	79	55	158
Interest cost	293	229	587	458
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	156	0	312
Amortization of actuarial (gain) loss	(166)	(95)	(332)	(190)
Net periodic cost before pension settlement charge			310	738
Pension settlement charge			0	0
Total net periodic cost	$ 155	$ 369	$ 310	$ 738