Income Taxes (Details) (USD $)	3 Months Ended
Apr. 04, 2015	Mar. 29, 2014
Income Taxes
Income tax expense	$ 689,000us-gaap_IncomeTaxExpenseBenefit	$ 1,470,000us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate (as a percent)	9.70%	15.30%
Gross unrecognized tax benefits	3,800,000us-gaap_UnrecognizedTaxBenefits
Amount of estimated decrease in unrecognized tax benefits	$ 600,000

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Amount of (increase) decrease reasonably possible in the estimated upper bound of the unrecognized tax benefit for a tax position taken or expected to be taken.

+ References

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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