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Share-based Compensation (Details) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 27, 2011	Sep. 28, 2010	Sep. 27, 2011	Sep. 28, 2010
Share-based Compensation
Number of common shares that an RSU holder would receive upon satisfaction of vesting requirement (in shares)	1		1
Share-based compensation expenses
Share-based compensation expense	$ 2,418	$ 1,969	$ 8,151	$ 5,705
Labor expense
Share-based compensation expenses
Share-based compensation expense	1,000	876	2,934	2,479
General and administrative expense
Share-based compensation expenses
Share-based compensation expense	$ 1,418	$ 1,093	$ 5,217	$ 3,226

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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