Pension and Other Postretirement Employee Benefits (Components Of Net Periodic Cost (Benefit)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,652	$ 2,045	$ 3,501	$ 4,090
Interest cost	2,611	2,633	5,423	5,266
Expected return on plan assets	(2,258)	(3,525)	(5,403)	(7,050)
Amortization of prior service cost (credit)	18	21	36	42
Amortization of actuarial loss (gain)	1,148	3,578	3,102	7,299
Net periodic cost before pension settlement charge			6,659	9,647
Pension settlement charge			14,165	0
Total net periodic cost	3,171	4,752	20,824	9,647
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	79	168	158	336
Interest cost	229	317	458	634
Expected return on plan assets	0	0	0	0
Amortization of prior service cost (credit)	156	(298)	312	(596)
Amortization of actuarial loss (gain)	(95)	545	(190)	1,090
Net periodic cost before pension settlement charge			738	1,464
Pension settlement charge			0	0
Total net periodic cost	$ 369	$ 732	$ 738	$ 1,464