Pension and Other Postretirement Employee Benefits (Components Of Net Periodic Cost (Benefit)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,652	$ 2,045	$ 5,153	$ 6,135
Interest cost	2,611	2,633	8,034	7,899
Expected return on plan assets	(2,259)	(3,525)	(7,662)	(10,575)
Amortization of prior service cost (credit)	19	21	55	63
Amortization of actuarial loss (gain)	1,150	3,578	4,252	10,877
Net periodic cost before pension settlement charge			9,832	14,399
Pension settlement charge			14,165	0
Total net periodic cost	3,173	4,752	23,997	14,399
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	79	168	237	504
Interest cost	228	317	686	951
Expected return on plan assets	0	0	0	0
Amortization of prior service cost (credit)	155	(298)	467	(894)
Amortization of actuarial loss (gain)	(96)	545	(286)	1,635
Net periodic cost before pension settlement charge			1,104	2,196
Pension settlement charge			0	0
Total net periodic cost	$ 366	$ 732	$ 1,104	$ 2,196