Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 30, 2014	Dec. 28, 2013
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 975	$ 907
Property, plant and equipment, accumulated depreciation	$ 631,991	$ 625,593
Redeemable common stock, par value	$ 0.01	$ 0.01
Redeemable common stock, shares authorized	30,000,000	30,000,000
Redeemable common stock, shares issued	8,128,417	8,129,112
Redeemable common stock, shares outstanding	8,128,417	8,129,112