Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			200	900
Net income (loss)	$ 6,534	$ 5,039	$ 10,868	$ 9,861
Basic income (loss) per share	$ 0.24	$ 0.19	$ 0.41	$ 0.36
Weighted average shares outstanding, basic	26,719	27,180	26,788	27,148
Diluted income (loss) per share	$ 0.24	$ 0.18	$ 0.40	$ 0.36
Weighted average dilutive stock options	47	179	48	155
Weighted average shares outstanding, diluted	26,766	27,359	26,836	27,303