Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ 5,974	$ 4,946	$ 33,602	$ 15,814
Basic income (loss) per share	$ 0.24	$ 0.19	$ 1.32	$ 0.59
Weighted average shares outstanding, basic	25,424	26,557	25,482	26,708
Diluted income (loss) per share	$ 0.23	$ 0.19	$ 1.31	$ 0.59
Weighted average dilutive stock options	146	27	97	37
Weighted average shares outstanding, diluted	25,570	26,584	25,579	26,745