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Income Taxes (Details) (USD $)	3 Months Ended
Income Taxes (Details) (USD $)	Mar. 30, 2013	Mar. 31, 2012
Income Taxes
Income tax expense	$ 44,000	$ 2,797,000
Effective income tax rate (as a percent)	0.20%	16.30%
Gross unrecognized tax benefits	4,300,000
Gross unrecognized tax benefits which would affect the effective tax rate if recognized	4,100,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 1,300,000

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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