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Share-based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 25, 2013	Jun. 26, 2012	Jun. 25, 2013	Jun. 26, 2012
Share-based Compensation
Number of common shares that an RSU holder would receive upon satisfaction of the vesting requirement (in shares)	1		1
Share-based compensation expenses
Share-based compensation expense	$ 3,459	$ 3,271	$ 6,971	$ 6,324
Labor expense
Share-based compensation expenses
Share-based compensation expense	1,341	1,123	2,671	2,129
General and administrative expense
Share-based compensation expenses
Share-based compensation expense	$ 2,118	$ 2,148	$ 4,300	$ 4,195

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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