Incentive Plans (Schedule Of Assumptions To Estimate The Fair Value) (Details) (Performance Units [Member])	12 Months Ended
	Dec. 31, 2013 Rate	Dec. 31, 2012 Rate	Dec. 31, 2011 Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.40%	0.40%	1.32%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of volatilities	42.90%	49.00%	84.10%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of volatilities	30.40%	33.60%	50.20%