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Income Taxes (Details 1)	12 Months Ended
Income Taxes (Details 1)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of statutory federal income tax rate and effective income tax rate as a percentage
Income tax expense computed at the statutory federal income tax rate	35.00%	35.00%	(35.00%)
Domestic production activities deduction		(0.60%)
State taxes and other	1.10%	2.60%	0.20%
Statutory depletion	(0.10%)	(0.10%)
Effective income tax rate	36.00%	36.90%	(34.80%)

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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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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