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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 tax expense (benefit) totaled	$ 10,906,000	$ (5,373,000)	$ 22,640,000	$ (28,441,000)
Effective tax benefit rate on income tax expense			32.80%	54.40%
Expecting effective income tax rate for the remainder of the year			34.10%
Income tax receivables					23,500,000
Net Operating Loss for 2009 to the 2007 Tax Year [Member]
Income tax receivables					10,600,000
Low Income Housing Tax Credits for 2009 to the 2008 Tax Year [Member]
Income tax receivables					$ 10,300,000

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit that is attributable to changes in the income tax laws or rates.

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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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