Pension Plans And Other Postretirement Benefits (Components Of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 357	$ 401
Interest cost	3,908	4,308
Expected return on plan assets	(4,696)	(5,672)
Amortization of prior service cost	81	171
Amortization of actuarial (gain) loss	751	809
Net periodic benefit cost	401	17
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	363	337
Interest cost	1,112	1,119
Expected return on plan assets	(1,105)	(1,093)
Amortization of actuarial (gain) loss	(267)	(329)
Net periodic benefit cost	$ 103	$ 34