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Income Taxes, Valuation Allowance (Details) (New Markets Tax Credit [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
New Markets Tax Credit [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 83.0
Expiration date	Jan. 01, 2029

The cumulative amount of future tax effects arising from the unused tax credit carryforward that cannot be utilized on the tax return during a year that may be carried forward to reduce taxable income or taxes payable in a future year; a tax credit carryforward is the amount by which tax credits available for utilization exceed statutory limitations.

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