Income Taxes (Schedule Of Reconciliation Of The U.S. Federal Statutory Rate To Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
U.S. federal statutory rate	35.00%	35.00%	35.00%
State income taxes	1.40%	2.10%	0.20%
Changes in reserve for uncertain tax positions as a result of settlements and lapsed statutes and related interest	(0.60%)	(0.50%)	(2.40%)
Other	0.20%		0.10%
Effective tax rate	36.00%	36.60%	32.90%