Income Tax (Schedule Of Income Tax Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax [Abstract]
Federal	35.00%	35.00%	35.00%
State income tax	5.00%	5.00%	5.00%
Depreciation related differences			1.00%
Cost of removal	(4.00%)	(4.00%)	(5.00%)
Other		(1.00%)	(3.00%)
Effective Tax Rate	36.00%	35.00%	33.00%