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, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8,182	$ 8,932	$ 7,767
Interest cost	10,533	12,263	18,465
Expected return on plan assets	(14,100)	(15,474)	(22,190)
Amortization of prior service cost (credit)	86	111	211
Amortization of actuarial loss	14,455	15,426	13,497
Net periodic cost (benefit) before pension settlement charge	19,156	21,258	17,750
Pension settlement charge		42,988
Net periodic cost (benefit)	19,156	64,246	17,750
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	670	508	371
Interest cost	1,267	1,502	1,588
Amortization of prior service cost (credit)	(1,192)	(1,274)	(8,844)
Amortization of actuarial loss	2,178	1,672	1,012
Net periodic cost (benefit) before pension settlement charge	2,923	2,408	(5,873)
Net periodic cost (benefit)	$ 2,923	$ 2,408	$ (5,873)