Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 24, 2014	Sep. 25, 2013	Sep. 24, 2014	Sep. 25, 2013
Earnings Per Share [Abstract]
Net income	$ 8,343	$ 7,031	$ 23,047	$ 20,310
Weighted average shares outstanding - basic (in shares)	85,061	90,035	86,882	91,348
Effect of dilutive share-based compensation awards	1,922	1,932	1,962	2,029
Weighted average shares outstanding - diluted (in shares)	86,983	91,967	88,844	93,377
Basic net income per share	$ 0.10	$ 0.08	$ 0.27	$ 0.22
Diluted net income per share	$ 0.10	$ 0.08	$ 0.26	$ 0.22
Antidilutive share-based compensation awards (in shares)	252	331	549	331