Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Amounts Recorded in AOCI on Consolidated Balance Sheets, Not Recognized as Components of Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Pension Plans [Member]
Net (loss) income	$ (33,702)	$ (27,307)
Prior service cost	0	(15)
Total amount unrecognized	(33,702)	(27,322)
OPEB [Member]
Net (loss) income	5,051	8,397
Prior service cost	0	0
Total amount unrecognized	$ 5,051	$ 8,397