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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Basic net income per share:        
Net income $ 87,312 $ 76,603 $ 298,683 $ 258,823
Weighted average number of shares outstanding, basic 135,525 137,367 135,997 138,293
Net income per share – basic $ 0.64 $ 0.56 $ 2.20 $ 1.87
Diluted net income per share:        
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) 1,216 1,496 1,295 1,709
Dilutive stock options and restricted stock units outstanding, per share (in dollars per share) $ (0.00) $ (0.01) $ (0.02) $ (0.02)
Net income $ 87,312 $ 76,603 $ 298,683 $ 258,823
Weighted average number of shares outstanding, diluted 136,741 138,863 137,292 140,002
Net income per share, diluted (in dollars per share) $ 0.64 $ 0.55 $ 2.18 $ 1.85
Antidilutive securities excluded from computation of earnings per share, amount 700 1,400 900 1,100