Employee Benefit Plans And Other Postretirement Benefits (Schedule Of Net Periodic Benefit Cost Expected To Be Recognized) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service cost (credit)	$ (1,129)
Net actuarial loss	31,409
Amounts expected to be recognized in net periodic benefit cost, net of tax	30,280
Pension and SERPA Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service cost (credit)	636
Net actuarial loss	29,182
Amounts expected to be recognized in net periodic benefit cost, net of tax	29,818
Postretirement Healthcare Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service cost (credit)	(1,765)
Net actuarial loss	2,227
Amounts expected to be recognized in net periodic benefit cost, net of tax	$ 462