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Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
Income Taxes (Details) (USD $)	Jul. 02, 2011	Jul. 03, 2010	Jul. 02, 2011	Jul. 03, 2010
Income Taxes
Income tax expense	$ 3,244,000	$ 9,625,000	$ 10,918,000	$ 14,557,000
Income tax rate (as a percent)	19.50%	31.40%	48.90%	25.70%
Gross unrecognized tax benefits which would affect the effective tax rate if recognized	$ 12,100,000		$ 12,100,000

- 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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