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Stock-Based Compensation (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 29, 2012
Options, Outstanding at December 31, 2011, Shares	3,064
Options, Granted, Shares	583
Options, Forfeited, Shares	(176)
Options, Expaired, Shares	(11)
Options, Outstanding at June 29, 2012, Shares	3,460
Options, Exercisable at June 29, 2012, Shares	2,177
Options, Outstanding at December 31, 2011, Weighted- Average Exercise Price	$ 4.79
Options, Granted, Weighted- Average Exercise Price	$ 10.86
Options, Forfeited, Weighted- Average Exercise Price	$ 5.40
Options, Expaired, Weighted- Average Exercise Price	$ 6.05
Options, Outstanding at June 29, 2012, Weighted- Average Exercise Price	$ 5.78
Options, Exercisable at June 29, 2012, Weighted- Average Exercise Price	$ 4.49
Options, Outstanding at June 29, 2012, Weighted- Average -Remaining Contractual Term (Years)	6 years 8 months 1 day
Options, Exercisable at June 29, 2012, Weighted- Average -Remaining Contractual Term (Years)	5 years 3 months 4 days
Options, Outstanding at June 29, 2012, Aggregate Intrinsic Value	$ 8,801
Options, Exercisable at June 29, 2012, Aggregate Intrinsic Value	$ 7,172

X

- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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