Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 25, 2014	Jun. 26, 2013	Jun. 25, 2014	Jun. 26, 2013
Earnings Per Share [Abstract]
Net income	$ 8,273	$ 6,198	$ 14,704	$ 13,279
Weighted average shares outstanding - basic (in shares)	86,781	91,659	87,792	92,004
Effect of dilutive share-based compensation awards	1,603	2,006	1,838	2,077
Weighted average shares outstanding - diluted (in shares)	88,384	93,665	89,630	94,081
Basic net income per share	$ 0.10	$ 0.07	$ 0.17	$ 0.14
Diluted net income per share	$ 0.09	$ 0.07	$ 0.16	$ 0.14
Antidilutive securities excluded from diluted weighted-average shares outstanding (in shares)	606	331	606	331