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, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5,422	$ 6,805	$ 8,182
Interest cost	12,551	10,646	10,533
Expected return on plan assets	$ (12,109)	$ (9,920)	$ (14,100)
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)	$ 45	$ 73	$ 86
Amortization of actuarial (gain) loss	(83)	5,400	14,455
Net periodic cost before pension settlement charge	5,826	13,004	19,156
Pension settlement charge	0	14,165	0
Other settlements	0	783	0
Net periodic cost (benefit)	5,826	27,952	19,156
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	110	316	670
Interest cost	1,175	914	1,267
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	$ (381)	$ (1,192)
Amortization of actuarial (gain) loss	(665)	623	2,178
Net periodic cost before pension settlement charge	620	1,472	2,923
Pension settlement charge	0	0	0
Other settlements	0	0	0
Net periodic cost (benefit)	$ 620	$ 1,472	$ 2,923