Equity Incentive Plans (Details) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Oct. 02, 2011 USD ($)
Summary of the activity of stock option awards
Options outstanding, Beginning Balance , Shares	1,401
Options outstanding, Beginning Balance, Wtd. Avg. Exercise Price	$ 15.01
Options outstanding, Beginning Balance, Wtd. Avg., Remaining Contractual Term	5.84
Options outstanding, Beginning Balance, Average Intrinsic Value	$ 13,517
Options granted, Shares	554
Options granted, Wtd. Avg. Exercise Price	$ 24.71
Options exercised, Shares	(297)
Options exercised, Wtd. Avg. Exercise Price	$ 8.22
Options forfeited/canceled/expired, Shares	(43)
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price	$ 19.71
Options outstanding, Ending Balance , Shares	1,615
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price	$ 19.47
Options outstanding, Ending Balance, Wtd. Avg., Remaining Contractual Term	6.97
Options outstanding, Ending Balance, Average Intrinsic Value	3,516
Options exercisable at October 2, 2011, Shares	901
Options exercisable at October 2, 2011, Wtd. Avg. Exercise Price	$ 16.8
Options exercisable at October 2, 2011, Wtd. Avg. Remaining Contractual Term	5.53
Options exercisable at October 2, 2011, Aggregate Intrinsic Value	$ 3,429
Summary of the activity of restricted stock
Restricted stock outstanding shares, Beginning Balance	161
Restricted stock outstanding Wtd. Avg. Grant Date Fair Value, Beginning Balance	$ 21.12
Granted shares	376
Granted Wtd. Avg. Grant Date Fair Value	$ 24.57
Vested shares	(84)
Vested Wtd. Avg. Grant Date Fair Value	$ 22.85
Forfeited/canceled shares
Forfeited/canceled Wtd. Avg. Grant Date Fair Value
Restricted stock outstanding shares, Ending Balance	453
Restricted stock outstanding Wtd. Avg. Grant Date Fair Value, Ending Balance	$ 23.66