CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 25, 2011
Stockholders' equity:
Common stock, par value	$ 0.008	$ 0.008	$ 0.008
Common stock, shares authorized	200,000	200,000	200,000
Common stock, shares, issued	81,366	80,401	79,808
Common stock, shares outstanding	71,070	71,265	71,592
Preferred stock, par value	$ 1.00	$ 1.00	$ 1.00
Preferred stock, shares authorized	40	40	40
Preferred stock, shares issued	0	0	0
Preferred stock, shares outstanding	0	0	0
Treasury stock - at cost, shares	10,296	9,136	8,216