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Pension and Other Postretirement Employee Benefits (Components Of Net Periodic Cost (Benefit)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Pension Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,942 $ 2,181 $ 5,825 $ 6,272
Interest cost 4,618 4,344 13,849 12,648
Expected return on plan assets (5,548) (5,095) (16,643) (14,938)
Amortization of prior service cost (credit) 52 46 158 139
Amortization of actuarial loss 3,374 4,148 10,122 12,442
Net periodic cost (benefit) 4,438 5,624 13,311 16,563
OPEB [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 93 99 278 242
Interest cost 397 391 1,191 1,091
Amortization of prior service cost (credit) (2,211) (2,219) (6,633) (6,658)
Amortization of actuarial loss 253 327 760 983
Net periodic cost (benefit) $ (1,468) $ (1,402) $ (4,404) $ (4,342)