The sum of the tax effects as of the balance sheet date of the amount of excesses of tax deductions over gross income in a year which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset.

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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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- 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 the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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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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Income Taxes (Narrative) (Details) (USD $)	3 Months Ended								12 Months Ended
Income Taxes (Narrative) (Details) (USD $)	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Federal tax rate									35.00%
Operating income (loss)	$ (383,863,000)	$ (4,198,000)	$ (20,576,000)	$ 21,330,000	$ (1,274,000)	$ (17,951,000)	$ (15,239,000)	$ (17,090,000)	$ (386,807,000)	$ (51,554,000)	$ (209,355,000)
Deferred tax assets, operating loss carry forwards	612,600,000								612,600,000
Unrecognized Tax Benefits	1,722,000				1,401,000				1,722,000	1,401,000	1,449,000
Income tax (benefit)									(55,658,000)	(23,849,000)	(81,227,000)
Interest receivable	0				200,000				0	200,000
Valuation allowance	94,500,000				1,000,000				94,500,000	1,000,000
Valuation allowance to offset the deferred tax asset									3,800,000
Federal Net Operating Loss [Member]
Operating income (loss)									(92,000,000)
Income Tax (Benefit) [Member]
Income tax (benefit)									$ (200,000)	$ (200,000)