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Income Taxes (Details) (USD $)	6 Months Ended
Income Taxes (Details) (USD $)	Jun. 30, 2011	Jun. 30, 2010
Effective income tax rate	35.00%	38.50%
Number of weeks required for Restore Employment Retention Credit	52
Maximum [Member]
Tax credit for each worker under new hire retention credit	$ 1,000

- Definition

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.

+ References+ Details