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Income Taxes (Details 2) (USD $)	12 Months Ended
Income Taxes (Details 2) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income tax provision (benefit) calculated using the federal statutory income tax rate	$ 323,416,000	$ 167,674,000	$ (42,765,000)
State income taxes, net of federal income tax benefit	29,555,000	13,087,000	(3,666,000)
Revaluation of deferred tax liabilities, net	(578,000)	11,502,000	0
Other	(1,681,000)	1,280,000	(602,000)
Total income tax expense (benefit)	$ 350,712,000	$ 193,543,000	$ (47,033,000)

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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