Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Income Taxes
Income tax expense	$ 5,937,000	$ 5,852,000	$ 7,407,000	$ 5,896,000
Effective income tax rate (as a percent)	29.40%	31.70%	24.90%	15.30%
Gross unrecognized tax benefits	3,500,000		3,500,000
Gross unrecognized tax benefits which would affect the effective tax rate if recognized	3,500,000		3,500,000
Decrease in gross unrecognized tax benefits related the lapse of the statute of limitations applicable to an uncertain tax position			$ 1,500,000