Net Income Per Share (Schedule Of Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015
Earnings Per Share [Abstract]
Net income	$ 21,119	$ 15,099	$ 53,742	$ 26,777
Weighted average shares outstanding: Basic (in shares)	32,913	31,979	32,688	33,473
Potentially dilutive common share equivalent (in shares)	1,000	356	936	529
Weighted average common shares outstanding: dilutive (in shares)	33,913	32,335	33,624	34,002
Basic net income per share (in dollars per share)	$ 0.64	$ 0.47	$ 1.64	$ 0.80
Diluted net income per share (in dollars per share)	$ 0.62	$ 0.47	$ 1.60	$ 0.79
Anti-dilutive employee stock-based awards, excluded (in shares)	0	2,768	235	2,486