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Income Taxes Summary of Valuation Allowance (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Valuation Allowance [Line Items]
Valuation Allowance, Amount	$ 5.5
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	$ 0

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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