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Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 26, 2013	Jun. 27, 2012	Jun. 26, 2013	Jun. 27, 2012
Numerator [Abstract]
Net income	$ 6,198	$ 4,601	$ 13,279	$ 10,466
Denominator [Abstract]
Weighted average shares - basic (in shares)	91,659	95,637	92,004	95,856
Effect of dilutive securities [Abstract]
Weighted average shares - diluted (in shares)	93,665	97,408	94,081	97,651
Basic net income per share	$ 0.07	$ 0.05	$ 0.14	$ 0.11
Diluted net income per share	$ 0.07	$ 0.05	$ 0.14	$ 0.11
Options [Member]
Effect of dilutive securities [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements	1,004	878	1,016	889
Antidilutive securities excluded from diluted weighted-average shares outstanding (in shares)	0	1,643	0	1,686
Restricted stock units and awards [Member]
Effect of dilutive securities [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements	1,002	893	1,061	906
Antidilutive securities excluded from diluted weighted-average shares outstanding (in shares)	331	702	331	702

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