Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 02, 2016	Jul. 04, 2015	Jul. 02, 2016	Jul. 04, 2015
Deferred:
Income tax expense	$ 1,710	$ 956	$ 1,975	$ 1,645
Effective income tax rate reconciliation
Effective income tax rate (as a percent)	9.90%	11.20%	8.50%	10.50%
Components of deferred taxes
Gross unrecognized tax benefits	$ 4,100		$ 4,100
Gross unrecognized tax benefits which would affect the effective tax rate if recognized	3,200		3,200
Interest in the provision for income taxes recognized			100	$ 100
Accrual for the payment of interest related to unrecognized tax positions	100		100
Amount of estimated decrease in unrecognized tax benefits	$ 1,100		$ 1,100