Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, unless otherwise specified	Dec. 25, 2011	Dec. 26, 2010
Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 171	$ 129
Property and equipment, accumulated depreciation	$ 375,078	$ 379,580
Common stock, no par value
Common stock, shares authorized	50,000	50,000
Common stock, shares issued	21,967	21,713
Common stock, shares outstanding	21,967	21,713