Pension Plans And Other Postretirement Benefits (Components Of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 707	$ 1,078
Interest cost	3,201	3,061
Expected return on plan assets	(5,895)	(5,907)
Amortization of prior service cost (credit)	134	140
Amortization of actuarial loss	435	1,071
Net periodic benefit cost	(1,418)	(557)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	478	698
Interest cost	842	840
Expected return on plan assets	(1,125)	(1,039)
Amortization of prior service cost (credit)		(108)
Amortization of actuarial loss	(334)	55
Net periodic benefit cost	$ (139)	$ 446