Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Deferred:
Income tax expense	$ 265	$ 689
Effective income tax rate reconciliation
Effective income tax rate (as a percent)	4.40%	9.70%
Components of deferred taxes
Gross unrecognized tax benefits	$ 4,200
Gross unrecognized tax benefits which would affect the effective tax rate if recognized	3,200
Amount of estimated decrease in unrecognized tax benefits	$ 1,100