Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Pre-Tax Components Of Net Periodic Cost (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5,285	$ 5,422	$ 6,805
Interest cost	12,492	12,551	10,646
Expected return on plan assets	$ (12,947)	$ (12,109)	$ (9,920)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax
Amortization of prior service cost (credit)	$ 20	$ 45	$ 73
Amortization of actuarial loss (gain)	78	(83)	5,400
Net periodic cost (benefit) before pension settlement charges	4,928	5,826	13,004
Pension settlement charge	0	0	14,165
Other settlements	0	0	783
Net periodic cost (benefit)	4,928	5,826	27,952
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	93	110	316
Interest cost	877	1,175	914
Expected return on plan assets	$ 0	$ 0	$ 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax
Amortization of prior service cost (credit)	$ 0	$ 0	$ (381)
Amortization of actuarial loss (gain)	(1,323)	(665)	623
Net periodic cost (benefit) before pension settlement charges	(353)	620	1,472
Pension settlement charge	0	0	0
Other settlements	0	0	0
Net periodic cost (benefit)	$ (353)	$ 620	$ 1,472