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Pension and Other Postretirement Employee Benefits (Components Of Net Periodic Cost (Benefit)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2,176 $ 1,862 $ 4,466 $ 3,883
Interest cost 2,568 4,692 6,132 9,231
Expected return on plan assets (3,151) (5,541) (7,737) (11,095)
Amortization of prior service cost (credit) 28 53 56 106
Amortization of actuarial loss 3,559 3,321 7,713 6,748
Net periodic cost (benefit) before pension settlement charge     10,630 8,873
Pension settlement charge     42,988  
Total net periodic cost (benefit) 5,180 4,387 53,618 8,873
OPEB [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 112 80 254 185
Interest cost 376 375 751 794
Amortization of prior service cost (credit) (319) (2,211) (638) (4,422)
Amortization of actuarial loss 417 200 836 507
Net periodic cost (benefit) before pension settlement charge     1,203 (2,936)
Total net periodic cost (benefit) $ 586 $ (1,556) $ 1,203 $ (2,936)