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Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
Income Taxes (Narrative) (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Line Items]
Operating loss carryforwards	$ 1,200,000,000
Statutory federal income tax rate	35.00%	35.00%	35.00%
Unrecognized tax benefits, would affect tax provision and effective tax rate	23,600,000
Uncertain tax position, accrued interest	4,900,000	1,600,000
Incremental state tax provision (expense)	$ 8,500,000
State [Member]
Income Taxes [Line Items]
Operating loss carryforwards, expiration dates	2012 through 2031

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

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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