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Stockholders' Equity (Details 2) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 28, 2012
Options, Outstanding at December 30, 2011, Shares 3,064
Options, Granted,shares 680
Options, Exercised, Shares (324)
Options, Forfeited or expired, Shares (44)
Options, Outstanding at December 28, 2012, Shares 3,376
Options, Exercisable at December 28, 2012, Shares 2,176
Options, Outstanding at December 31, 2011, Weighted- Average Exercise Price $ 4.79
Options, Granted, Weighted- Average Exercise Price $ 10.31
Options, Exercises in Period, Weighted-Average Exercise Price $ 4.67
Options, Forfeited or expired, Weighted- Average Exercise Price $ 6.87
Options, Outstanding at December 28, 2012, Weighted- Average Exercise Price $ 5.89
Options, Exercisable at December 28, 2012, Weighted - Average Exercise Price $ 4.62
Options, Outstanding at December 28, 2012, Weighted- Average Remaining Contractual Term Average 6 years 3 months 26 days
Options, Exercisable at December 28, 2012, Weighted- Average Remaining Contractual Term Average 4 years 11 months 27 days
Options, Outstanding at December 28, 2012, Intrinsic Value $ 19,873
Options, Exercisable December 28, 2012, Intrinsic Value $ 10,061