Net Income Per Share (Schedule Of Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 02, 2017	Apr. 03, 2016
Earnings Per Share [Abstract]
Net income	$ 15,994	$ 16,589
Weighted average shares outstanding: Basic (in shares)	32,944	32,519
Potentially dilutive common share equivalent (in shares)	1,192	750
Weighted average common shares outstanding: dilutive (in shares)	34,136	33,269
Basic net income per share (in dollars per share)	$ 0.49	$ 0.51
Diluted net income per share (in dollars per share)	$ 0.47	$ 0.50
Anti-dilutive employee stock-based awards, excluded (in shares)	70	486