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Share-based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 26, 2013	Mar. 27, 2012
Share-based Compensation
Number of common shares that an RSU holder would receive upon satisfaction of the vesting requirement (in shares)	1
Share-based compensation expenses
Share-based compensation expense	$ 3,512	$ 3,053
Labor expense
Share-based compensation expenses
Share-based compensation expense	1,330	1,006
General and administrative expense
Share-based compensation expenses
Share-based compensation expense	$ 2,182	$ 2,047

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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