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, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 6,805	$ 8,182	$ 8,932
Interest cost	10,646	10,533	12,263
Expected return on plan assets	$ (9,920)	$ (14,100)	$ (15,474)
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)	$ 73	$ 86	$ 111
Amortization of actuarial loss	5,400	14,455	15,426
Net periodic cost before pension settlement charge	13,004	19,156	21,258
Pension settlement charge	14,165	0	42,988
Other settlements	783	0	0
Net periodic cost (benefit)	27,952	19,156	64,246
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	316	670	508
Interest cost	914	1,267	1,502
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)	$ (381)	$ (1,192)	$ (1,274)
Amortization of actuarial loss	623	2,178	1,672
Net periodic cost before pension settlement charge	1,472	2,923	2,408
Pension settlement charge	0	0	0
Other settlements	0	0	0
Net periodic cost (benefit)	$ 1,472	$ 2,923	$ 2,408