Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Difference between federal tax expense (benefit) at statutory rate and at our effective rate
Federal tax expense, at statutory rate	$ 166,064	$ 154,418	$ 16,678
State income tax expense, net of federal benefit	16,606	15,751	1,620
State income rate changes	2,251	3,851	(2,252)
Non-deductible expenses	477	457	4,130
Change in valuation allowance	(3,195,651)	(166,452)	(21,749)
Other, net	12,019	6,209	6,193
Income tax (benefit) expense	$ (2,998,234)	$ 14,234	$ 4,620

Income tax reconciliation state rate changes.

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- 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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- Definition

The sum of the differences between total income tax expense or benefit as reported in the Income Statement for the period 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 nondeductible expenses under enacted tax laws, or differences in the methodologies used to determine expense amounts for financial statements prepared in accordance with generally accepted accounting principles and enacted tax laws.

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The sum of other amounts reflected in the reconciliation of the statutory tax provision (benefit) to the actual tax provision (benefit).

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to state and local income tax expense or benefit.

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- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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