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Leases (Net Rental Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 26, 2012	Dec. 28, 2011	Dec. 29, 2010
Rental Expense:
Base rents	$ 38,326	$ 40,278	$ 42,575
Contingent rents	5,762	5,575	4,374
Total rent expense	44,088	45,853	46,949
Rental income:
Base rents	37,363	35,337	35,882
Contingent rents	3,871	2,812	2,660
Total rental income	41,234	38,149	38,542
Net rental expense:
Base rents	963	4,941	6,693
Contingent rents	1,891	2,763	1,714
Net rental expense	$ 2,854	$ 7,704	$ 8,407

X

- Definition

The total amount of lease revenue recognized for the period which the lessee was obligated under leasing arrangements regardless of any other events or conditions. This amount excludes contingent revenue.

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Minimum rental expense for the reporting period incurred under operating leases, net of related sublease income.

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Contingent rental expense for the reporting period incurred under operating leases, net of related sublease income.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense.

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Amount of contingent rental revenue recognized for the period under lease, based on the occurrences of an event or condition.

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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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The increases or decreases in lease payments that result from changes occurring after the inception of the lease in the factors (other than the passage of time) on which lease payments are based, except that any escalation of minimum lease payments relating to increases in construction or acquisition cost of the leased property or for increases in some measure of cost or value during the construction or preconstruction period, are excluded from contingent rentals. Contingent rentals also may include amounts for which the triggering events have not yet occurred or the specified targets for which have not yet been achieved (such as sales based percentage rent), but which events are considered probable of occurring or which specified targets are considered probable of being achieved.

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This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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