Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Valuation allowance [Abstract]
Increase in valuation allowance	$ 1.0
Total valuation allowance relating to federal and state deferred tax asset	$ 18.1
Effective tax rate (in hundredths)	(1.60%)	(1.00%)

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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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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