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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Basic net income per share:    
Net income $ 71,433 $ 60,311
Weighted average number of shares outstanding, basic 124,477 130,276
Net income per share – basic $ 0.57 $ 0.46
Diluted net income per share:    
Dilutive stock options and restricted stock units outstanding, income $ 0 $ 0
Dilutive stock options and restricted stock units outstanding, per share (in shares) 697 814
Dilutive stock options and restricted stock units outstanding, per share (in dollars per share) $ (0.00) $ (0.00)
Net income $ 71,433 $ 60,311
Weighted average number of shares outstanding, diluted 125,174 131,090
Net income per share, diluted (in dollars per share) $ 0.57 $ 0.46
Antidilutive securities excluded from computation of earnings per share, amount 3,700 2,800