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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 28, 2018
Mar. 29, 2017
Earnings Per Share [Abstract]    
Net income $ 9,759 $ 8,373
Weighted average shares outstanding - basic (in shares) 64,432 71,004
Effect of dilutive share-based compensation awards 2,514 2,237
Weighted average shares outstanding - diluted (in shares) 66,946 73,241
Basic net income per share $ 0.15 $ 0.12
Diluted net income per share $ 0.15 $ 0.11
Antidilutive share-based compensation awards (in shares) 471 580