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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Earnings Per Share    
Net income $ 5,398 $ 26,405
Shares used in computing basic earnings per share 43,189 42,963
Effect of dilutive securities:    
Stock options and other stock-based awards 527 955
Shares used in computing diluted earnings per share 43,716 43,918
Earnings per share:    
Basic (in dollars per share) $ 0.12 $ 0.61
Diluted (in dollars per share) $ 0.12 $ 0.60
Shares consisting of restricted stock awards (RSUs), market stock awards (MSUs) and stock options excluded from computation of diluted earning per share 500 0
Shares attributable to dilutive effect of conversion of debt securities   100