Pension Plans And Other Postretirement Benefits (Components Of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 400	$ 707	$ 801	$ 1,414
Interest cost	4,309	3,202	8,617	6,403
Expected return on plan assets	(5,673)	(5,894)	(11,345)	(11,789)
Amortization of prior service cost	171	134	342	268
Amortization of actuarial loss	809	436	1,618	871
Net periodic benefit cost (credit)	16	(1,415)	33	(2,833)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	337	477	674	955
Interest cost	1,119	843	2,238	1,685
Expected return on plan assets	(1,093)	(1,126)	(2,186)	(2,251)
Amortization of actuarial loss	(330)	(334)	(659)	(668)
Net periodic benefit cost (credit)	$ 33	$ (140)	$ 67	$ (279)