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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 8,932 $ 7,767 $ 8,454
Interest cost 12,263 18,465 16,992
Expected return on plan assets (15,474) (22,190) (20,035)
Amortization of prior service cost (credit) 111 211 186
Amortization of actuarial loss 15,426 13,497 16,589
Net periodic cost (benefit) before pension settlement charge 21,258 17,750 22,186
Pension settlement charge 42,988    
Net periodic cost (benefit) 64,246 17,750 22,186
OPEB [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 508 371 341
Interest cost 1,502 1,588 1,482
Amortization of prior service cost (credit) (1,274) (8,844) (8,877)
Amortization of actuarial loss 1,672 1,012 1,311
Net periodic cost (benefit) before pension settlement charge 2,408 (5,873) (5,743)
Net periodic cost (benefit) $ 2,408 $ (5,873) $ (5,743)