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Income Taxes Income Taxes - Valuation Allowance (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Income Taxes [Abstract]
Reduction in Valuation Allowance Recorded Against Net Deferred Tax Assets	$ (143)
Deferred Tax Assets, Valuation Allowance	$ 140,682

The sum of the portions of deferred tax assets as of the balance sheet date for which, based on the weight of available evidence, it is more likely than not will not be realized through future reductions of tax-based income.

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