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Income Taxes (Details) (USD $)	3 Months Ended								12 Months Ended
Income Taxes (Details) (USD $)	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
Operating Loss Carryforwards [Line Items]
Income tax benefit	$ (3,201,000)	$ 0	$ (288,842,000)	$ 0	$ 0	$ 0	$ 0	$ 0	$ (292,043,000)	$ 0	$ 0
Deferred tax asset, net	292,082,000				0				292,082,000	0
Operating loss and tax credit carryforward included in deferred tax asset	274,000,000				285,000,000				274,000,000	285,000,000
Deferred Tax Assets, Valuation Allowance	$ 1,764,000				$ 327,449,000				$ 1,764,000	$ 327,449,000

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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