Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 30, 2012
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 693	$ 378
Property and equipment, accumulated depreciation	115,814	112,292
Other intangibles, accumulated amortization	$ 2,560	$ 2,456
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	34,487,250	34,434,858
Common stock, shares outstanding	34,487,250	34,434,858
Treasury stock, shares	71,950	71,950