Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 27, 2013	Mar. 28, 2012
Numerator [Abstract]
Net income	$ 7,081	$ 5,865
Denominator [Abstract]
Weighted average shares - basic (in shares)	92,350	96,075
Effect of dilutive securities [Abstract]
Weighted average shares - diluted (in shares)	94,461	97,878
Basic net income per share	$ 0.08	$ 0.06
Diluted net income per share	$ 0.07	$ 0.06
Options [Member]
Effect of dilutive securities [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements	1,023	904
Antidilutive securities excluded from diluted weighted-average shares outstanding (in shares)	0	1,730
Restricted stock units and awards [Member]
Effect of dilutive securities [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements	1,088	899
Antidilutive securities excluded from diluted weighted-average shares outstanding (in shares)	331	715

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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