Retirement Plans (Weighted Average Assumptions Used To Determine Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets (in hundredths)	7.50%	7.50%
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (in hundredths)	4.60%	5.50%	6.10%
Expected long-term rate of return on plan assets (in hundredths)	7.50%	7.50%	7.50%
Rate of compensation increase (in hundredths)	4.25%	4.25%	4.00%
SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (in hundredths)	4.60%	5.50%	6.10%
Expected long-term rate of return on plan assets (in hundredths)	0.00%	0.00%	0.00%
Rate of compensation increase (in hundredths)	0.00%	0.00%	0.00%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate (in hundredths)	4.60%	5.50%	6.10%
Initial rate (in hundredths)	7.50%	8.00%	7.50%
Ultimate rate (in hundredths)	5.00%	5.00%	5.00%
Years to ultimate	2017	2017	2015