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Income Taxes Valuation Allowance Rollforward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 30, 2011	Dec. 31, 2010
Valuation Allowance Rollforward [Abstract]
Balance, beginning of year	$ 46,323	$ 20,027	$ 26,297
Additions	(11,411)	(26,296)	(5,008)
Reductions	0	0	11,278
Balance, end of year	$ 57,734	$ 46,323	$ 20,027

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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- Definition

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.

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