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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. 27, 2012		Jun. 29, 2011		Jun. 27, 2012		Jun. 29, 2011
Numerator [Abstract]
Net income	$ 4,601		$ 8,130		$ 10,466		$ 12,254
Denominator [Abstract]
Weighted average shares - basic (in shares)	95,637		98,421		95,856		98,700
Effect of dilutive securities [Abstract]
Options (in shares)	878		998		889		1,139
Restricted stock units and awards (in shares)	893		1,183		906		1,137
Weighted average shares - diluted (in shares)	97,408		100,602		97,651		100,976
Basic and diluted net income per share (in dollars per share)	$ 0.05		$ 0.08		$ 0.11		$ 0.12
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from diluted weighted-average shares outstanding (in shares)	1,643	[1]	2,372	[1]	1,686	[1]	2,230	[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)	702	[1]	538	[1]	702	[1]	747	[1]
[1] Excluded from diluted weighted-average shares outstanding as the impact would have been antidilutive.

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