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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Dec. 31, 2012
Income Taxes
Deferred tax assets valuation allowance	$ 145
Cumulative loss position in the United States	3 years
Percentage of valuation allowance	100.00%
Deferred tax assets, net of valuation allowance	$ 0

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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