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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 29, 2019
Mar. 30, 2018
Numerator For Basic And Diluted EPS:    
Net income $ 16,906 $ 10,564
Denominator for basic EPS:    
Weighted-average shares outstanding 20,267 20,135
Effect of dilutive securities:    
Diluted potential common shares (in shares) 339 439
Denominator for diluted EPS:    
Adjusted weighted-average shares outstanding 20,606 20,574
Basic EPS (in usd per share) $ 0.83 $ 0.52
Diluted EPS (in usd per share) $ 0.82 $ 0.51
Stock Appreciation Rights (SARs)    
Effect of dilutive securities:    
Dilutive effect of share-based compensation (in shares) 107 203
Restricted Stock Units (RSUs)    
Effect of dilutive securities:    
Dilutive effect of share-based compensation (in shares) 83 98
Performance Shares    
Effect of dilutive securities:    
Dilutive effect of share-based compensation (in shares) 149 138