CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data	Jul. 01, 2011	Dec. 31, 2010
CONDENSED CONSOLIDATED BALANCE SHEETS
Accounts receivable - trade, allowance for doubtful accounts (in dollars)	$ 8,120	$ 9,088
Senior preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Senior preferred stock, shares authorized	20,000,000	20,000,000
Senior preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	33,527,352	33,336,373
Common stock, shares outstanding	33,358,650	33,214,073
Treasury stock, shares	168,702	122,300