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Earnings Per Share - Reconciliation of Basic and Diluted EPS Calculations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Earnings Per Share [Abstract]        
Net income $ 1,546 $ 3,026 $ 17,120 $ 24,467
Weighted average shares outstanding for basic EPS 56,414 56,211 56,363 56,176
Effect of dilutive securities:        
Stock options 2,045 959 1,918 638
Weighted average shares outstanding for diluted EPS 58,459 57,170 58,281 56,814
Basic EPS (in usd per share) $ 0.03 $ 0.05 $ 0.30 $ 0.44
Diluted EPS (in usd per share) $ 0.03 $ 0.05 $ 0.29 $ 0.43
Stock Options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive options outstanding excluded from EPS 0 0 339 92