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Income Taxes (Federal Income Tax Rate) (Details)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Tax Disclosure [Abstract]      
Statutory U.S. federal tax rate 35.00% 35.00% 35.00%
State taxes, net of federal benefit 6.30% 5.80% 5.70%
Increase (decrease) in domestic valuation allowance (2.50%) (0.10%) 4.50%
Impact of revised state apportionment estimates (33.40%) 3.00% (2.70%)
Other, net 0.90% 1.00% 0.10%
Effective Tax Rate 6.30% 44.70% 42.60%