Net Income Per Share (Schedule Of Net Income Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Net income	$ 14,411	$ 15,343
Weighted average shares outstanding: Basic (in shares)	36,630,000	38,433,000
Weighted average shares outstanding: Dilutive potential common shares (in shares)	675,000	617,000
Weighted average shares outstanding: Total diluted shares (in shares)	37,305,000	39,050,000
Basic net income per share (in dollars per share)	$ 0.39	$ 0.40
Diluted net income per share (in dollars per share)	$ 0.39	$ 0.39
Anti-dilutive common stock options (in shares)	2,600,000	2,400,000