Employee Benefit Plans and Other Postretirement Benefits (Schedule Of Net Periodic Benefit Cost Recognized In Accumulated And Other Comprehensive Income) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (credit)	$ (23,752)
Net actuarial loss	605,613
Amounts included in other comprehensive income, net of tax	581,861
Pension and SERPA Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (credit)	(14,371)
Net actuarial loss	593,608
Amounts included in other comprehensive income, net of tax	579,237
Postretirement Health Coverage
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (credit)	(9,381)
Net actuarial loss	12,005
Amounts included in other comprehensive income, net of tax	$ 2,624