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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 30, 2018
Mar. 31, 2017
Numerator For Basic And Diluted EPS:    
Net income $ 10,564 $ 3,050
Denominator for basic EPS:    
Weighted-average shares outstanding 20,135 19,969
Effect of dilutive securities:    
Diluted potential common shares (in shares) 439 406
Denominator for diluted EPS:    
Adjusted weighted-average shares outstanding 20,574 20,375
Basic EPS (in usd per share) $ 0.52 $ 0.15
Diluted EPS (in usd per share) $ 0.51 $ 0.15
Stock Appreciation Rights (SARs)    
Effect of dilutive securities:    
Dilutive effect of share-based compensation (in shares) 203 187
Restricted Stock Units (RSUs)    
Effect of dilutive securities:    
Dilutive effect of share-based compensation (in shares) 98 121
Performance Shares    
Effect of dilutive securities:    
Dilutive effect of share-based compensation (in shares) 138 98