Pension Plans And Other Postretirement Benefits (Components Of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2022
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 707	$ 775	$ 2,728	$ 2,121
Interest cost	3,202	3,351	9,667	9,605
Expected return on plan assets	(5,895)	(5,733)	(17,432)	(17,684)
Amortization of prior service cost (credit)	134	140	419	402
Amortization of actuarial loss	435	555	2,352	1,306
Net periodic benefit cost (credit)	(1,417)	(912)	(2,266)	(4,250)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	478	698	2,094	1,433
Interest cost	842	840	2,520	2,527
Expected return on plan assets	(1,142)	(1,039)	(3,117)	(3,376)
Amortization of prior service cost (credit)		(108)	(324)
Amortization of actuarial loss	(334)	55	165	(1,002)
Net periodic benefit cost (credit)	$ (156)	$ 446	$ 1,338	$ (418)