Net Income Per Share (Schedule Of Net Income Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Apr. 03, 2011
Earnings Per Share [Abstract]
Net income	$ 25,147	$ 21,189
Weighted average shares outstanding: Basic (in shares)	37,796,000	36,414,000
Weighted average shares outstanding: Dilutive potential common shares (in shares)	780,000	926,000
Weighted average shares outstanding: Total diluted shares (in shares)	38,576,000	37,340,000
Basic net income per share (in dollars per share)	$ 0.67	$ 0.58
Diluted net income per share (in dollars per share)	$ 0.65	$ 0.57
Anti-dilutive common stock options (in shares)	1,800,000	1,400,000