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Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation Abstract
State income tax provision net of federal benefit									$ (136,112)	$ 6,329	$ 3,608
Other, net									(4,618)	(1,692)	669
Income tax provision (benefit) computed at the U.S. statutory rate									(1,006,989)	248,805	253,076
Tax Effect Of Rate Change									1,358	4,228	1,939
Total income tax(benefit) provision	8,765	175	(754,642)	45,489	74,279	81,713	57,709	43,969	(700,213)	257,670	258,615
Change in valuation allowance									$ 446,148	$ 0	$ (677)

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 portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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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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