Employee Benefit Plans And Other Postretirement Benefits (Schedule Of Assumptions Used To Determine Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension and SERPA Benefits [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate, Benefit obligations	4.53%	4.21%	5.08%
Rate of compensation, Benefit obligations	3.50%	4.00%	4.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate, Net periodic benefit cost	4.21%	5.08%	4.23%
Expected return on plan assets	7.75%	7.75%	7.75%
Rate of compensation increase	4.00%	4.00%	4.00%
Postretirement Healthcare Benefits [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate, Benefit obligations	4.29%	3.99%	4.70%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate, Net periodic benefit cost	3.99%	4.70%	3.93%
Expected return on plan assets	7.70%	7.70%	8.00%