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, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (credit)	$ (726)
Net actuarial loss	29,752
Amounts expected to be recognized in net periodic benefit cost, net of tax	29,026
Pension and SERPA Benefits
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (credit)	641
Net actuarial loss	27,699
Amounts expected to be recognized in net periodic benefit cost, net of tax	28,340
Postretirement Health Coverage
Defined Benefit Plan Disclosure [Line Items]
Prior service cost (credit)	(1,367)
Net actuarial loss	2,053
Amounts expected to be recognized in net periodic benefit cost, net of tax	$ 686