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, 2015 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service cost (credit)	$ (3,599)
Net actuarial loss	564,752
Amounts included in other comprehensive income, net of tax	561,153
Pension and SERPA Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service cost (credit)	5,445
Net actuarial loss	513,107
Amounts included in other comprehensive income, net of tax	518,552
Postretirement Healthcare Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service cost (credit)	(9,044)
Net actuarial loss	51,645
Amounts included in other comprehensive income, net of tax	$ 42,601