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Income Taxes (Schedule Of Reconciliation Between The Federal Statutory Rate And The Effective Tax Rate) (Details)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Federal statutory rate 35.00% 35.00% 35.00%
State taxes, net of federal income tax benefit 2.90% 3.10% 3.20%
Nondeductible transaction costs   1.30%  
Other items 0.40% 0.40% 1.40%
Impact of income attributable to noncontrolling interests (2.80%) (4.20%) (3.70%)
Effective tax rate 35.50% 35.60% 35.90%