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Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 26, 2012		Sep. 28, 2011		Sep. 26, 2012		Sep. 28, 2011
Numerator [Abstract]
Net income	$ 5,363		$ 7,985		$ 15,829		$ 20,239
Denominator [Abstract]
Weighted average shares - basic (in shares)	94,705		96,997		95,472		98,132
Effect of dilutive securities [Abstract]
Options (in shares)	1,006		803		806		1,022
Restricted stock units and awards (in shares)	1,034		946		918		1,049
Weighted average shares - diluted (in shares)	96,745		98,746		97,196		100,203
Basic net income per share	$ 0.06		$ 0.08		$ 0.17		$ 0.21
Diluted net income per share	$ 0.06		$ 0.08		$ 0.16		$ 0.20
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from diluted weighted-average shares outstanding (in shares)	116	[1]	2,070	[1]	1,550	[1]	2,177	[1]
Restricted stock units and awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from diluted weighted-average shares outstanding (in shares)	0	[1]	538	[1]	352	[1]	747	[1]
[1] Excluded from diluted weighted-average shares outstanding as the impact would have been antidilutive.

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