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Income Taxes (Details 2)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation between the statutory United States Federal income tax rate and the Company's effective income tax rate      
Statutory rate 35.00% 35.00% 35.00%
State taxes 2.00% 2.10% 3.40%
Tax settlements (0.60%) 0.00% 4.80%
Changes in tax reserves (1.40%) 0.40% (10.70%)
Other, net (0.30%) 1.10% 2.50%
Effective rate 34.70% 38.60% 35.00%