Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 25, 2010
Income Taxes [Abstract]
Receivable valuations	$ 4,570	$ 5,014
Share-based payments	5,843	5,797
Self-insured claims	5,940	5,861
Other	5,316	6,137
Deferred tax assets, Total	21,669	22,809
Operating property	38,040	29,084
Other	8,259	8,284
Deferred tax liabilities, Total	46,299	37,368
Net deferred tax liability	$ 24,630	$ 14,559