Income Taxes (Schedule Of Reconciliation Of The U.S. Federal Statutory Rate To Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. federal statutory rate	21.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%	(0.70%)	(17.10%)
State income taxes	3.10%	3.50%	1.70%
Effective Income Tax Rate Reconciliation, Deduction, Percent	(0.90%)	(0.10%)	(0.40%)
Other	0.10%	0.30%	0.30%
Effective tax rate	23.30%	24.00%	19.50%