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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation
Income tax computed at statutory federal rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	3.00%	4.00%	4.00%
Deferred state rate impact	0.00%	(1.00%)	(5.00%)
Net impact to uncertain income tax positions	1.00%	0.00%	(2.00%)
Other	(1.00%)	2.00%	(2.00%)
Effective income tax rate	38.00%	40.00%	30.00%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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