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Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
Income Taxes (Details) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
INCOME TAXES [Abstract]
Effective income tax rate, continuing operations	26.80%	36.80%	27.20%	37.20%
Tax credits percentage of qualified maintenance expenditures to reduce federal income tax			50.00%
Tax credits limitation per mile on maintenance expenditures to reduce federal income tax			$ 3,500

- 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.

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