Stock-Based Compensation (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 29, 2012	Dec. 31, 2011
Options
Number of Shares Outstanding (Options), Beginning Balance	2,348,162
Number of Shares Outstanding (Options), Exercised	(403,397)
Number of Shares Outstanding (Options), Granted	221,785
Number of Shares Outstanding (Options), Cancelled	(112,087)
Number of Shares Outstanding (Options), Ending Balance	2,054,463	2,348,162
Number of Shares Outstanding (Options), Exercisable at September 29, 2012	1,206,804
Weighted Average Exercise Price, Beginning Balance	$ 10.53
Weighted Average Exercise Price, Exercised	$ 6.47
Weighted Average Exercise Price, Granted	$ 17.48
Weighted Average Exercise Price, Cancelled	$ 14.72
Weighted Average Exercise Price, Ending Balance	$ 11.85	$ 10.53
Weighted Average Exercise Price, Exercisable at September 29, 2012	$ 9.68
Weighed Average Remaining Contractual Term, Opening	4 years 6 months 10 days	4 years 10 months 10 days
Weighed Average Remaining Contractual Term, Closing	4 years 6 months 10 days	4 years 10 months 10 days
Weighed Average Remaining Contractual Term, Exercisable at September 29, 2012	3 years 10 months 0 days
Aggregate Intrinsic Value, Opening	$ 18,556
Aggregate Intrinsic Value, Closing	6,642	18,556
Aggregate Intrinsic Value, Exercisable at September 29, 2012	$ 5,811