CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 26, 2011
Stockholders' equity:
Preferred Stock, authorized (in shares)	40	40	40
Preferred Stock, par value (in dollars per share)	$ 1.00	$ 1.00	$ 1.00
Common Stock, authorized (in shares)	200,000	200,000	100,000
Preferred Stock, issued (in shares)	0	0	0
Common Stock, par value (in dollars per share)	$ 0.008	$ 0.008	$ 0.008
Common stock, issued (in shares)	81,065	80,401	79,426
Common stock, outstanding (in shares)	71,875	71,265	72,355
Treasury stock, at cost (in shares)	9,190	9,136	7,071