Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012
Income Taxes [Abstract]
Gain related to adjustment of tax expense to previously filed returns and recognition of state deferred tax asset	$ 12.6

Gain related to adjustment of tax expense to previously filed returns and recognition of state deferred tax asset.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration