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Income Taxes, Valuation Allowance (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 New Markets Tax Credit [Member]	Dec. 31, 2011 Internal Revenue Service (IRS) [Member]
Valuation Allowance [Line Items]
Deferred tax asset, NMTC carryforwards	$ 78.8
Tax Credit Carryforward, Expiration Date	Jan. 01, 2029
Operating Loss Carryforwards		$ 477.7

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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