Employee Benefit Plans (Schedule Of Allocation Of The Fair Value Of Plan Assets) (Details)	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentage	100.00%	100.00%
Cash and Short-Term Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentage	3.00%	3.00%
Large Company Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentage	20.00%	21.00%
Mid Company Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentage	8.00%	7.00%
Small Company Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentage	6.00%	4.00%
International Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentage	14.00%	15.00%
Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentage	35.00%	36.00%
Growth Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentage	14.00%	14.00%