Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 27, 2014	Dec. 28, 2013
Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 1,602	$ 1,441
Common stock, par value (in dollars per share)	$ 0.1167	$ 0.1167
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	39,819,550	39,394,196
Common stock, shares outstanding	39,819,550	39,394,196