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Net Income Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Jun. 29, 2013
Jun. 30, 2012
Earnings Per Share, Basic [Abstract]        
Net income, basic $ 123,580 $ 106,621 $ 167,586 $ 146,949
Weighted Average Number of Shares Outstanding, Basic 69,672,000 71,814,000 69,537,000 71,704,000
Net income per share - basic (in dollars per share) $ 1.77 $ 1.48 $ 2.41 $ 2.05
Earnings Per Share, Diluted [Abstract]        
Net income, dilutive 123,580 106,621 167,586 146,949
Weighted Average Number of Shares Outstanding, Diluted 70,790,000 73,488,000 70,775,000 73,491,000
Net income per share - diluted (in dollars per share) $ 1.75 $ 1.45 $ 2.37 $ 2.00
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) 1,118,000 1,674,000 1,238,000 1,787,000
Dilutive stock options and restricted stock units outstanding, per share (in dollars per share) $ (0.02) $ (0.03) $ (0.04) $ (0.05)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 700,000 600,000 600,000 400,000