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Net Income Per Share (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Reconciliation of the basic and diluted net income per share computations        
Weighted average common shares outstanding used in basic net income (loss) per share calculation 23,953 25,307 24,008 25,220
Potential dilutive common stock equivalents, using treasury stock method 489 599 480 660
Weighted average shares used in diluted net income (loss) per share calculation 24,442 25,906 24,488 25,880