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Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
Income Taxes (Details) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Income Taxes (Textuals) [Abstract]
Total valuation allowance of net deferred tax assets	$ 437,100,000		$ 437,100,000		$ 413,800,000
Recognized net deferred tax assets	47,200,000		47,200,000
Income tax expense (benefit)	$ 17,249,000	$ (4,174,000)	$ 28,411,000	$ 16,832,000
Effective income tax rate on consolidated net income (loss)	51.00%	43.00%	59.00%	(8.10%)

The sum of the portions of deferred tax assets as of the balance sheet date for which, based on the weight of available evidence, it is more likely than not will not be realized through future reductions of tax-based income.

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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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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