Pension Plans And Other Postretirement Benefits (Components Of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 400	$ 707	$ 1,201	$ 2,121
Interest cost	4,309	3,202	12,926	9,605
Expected return on plan assets	(5,673)	(5,895)	(17,018)	(17,684)
Amortization of prior service cost	171	134	513	402
Amortization of actuarial loss	810	435	2,428	1,306
Net periodic benefit cost (credit)	17	(1,417)	50	(4,250)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	337	478	1,011	1,433
Interest cost	1,119	842	3,357	2,527
Expected return on plan assets	(1,093)	(1,142)	(3,279)	(3,376)
Amortization of actuarial loss	(329)	(334)	(988)	(1,002)
Net periodic benefit cost (credit)	$ 34	$ (156)	$ 101	$ (418)