Net Income Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Earnings Per Share, Basic [Abstract]
Net income, basic	$ 64,767	$ 50,021	$ 232,353	$ 196,970
Weighted Average Number of Shares Outstanding, Basic	139,524,000	141,482,000	139,304,000	142,766,000
Net income per share - basic (in dollars per share)	$ 0.46	$ 0.35	$ 1.67	$ 1.38
Earnings Per Share, Diluted [Abstract]
Net income, dilutive	64,767	50,021	232,353	196,970
Weighted Average Number of Shares Outstanding, Diluted	141,726,000	144,626,000	141,689,000	146,196,000
Net income per share - diluted (in dollars per share)	$ 0.46	$ 0.35	$ 1.64	$ 1.35
Dilutive stock options and restricted stock units outstanding, income	$ 0	$ 0	$ 0	$ 0
Dilutive stock options and restricted stock units outstanding, per share (in shares)	2,202,000	3,144,000	2,385,000	3,430,000
Dilutive stock options and restricted stock units outstanding, per share (in dollars per share)	$ 0.00	$ 0.00	$ (0.03)	$ (0.03)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	700,000	800,000	1,200,000	900,000