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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 28, 2019
Jun. 29, 2018
Jun. 28, 2019
Jun. 29, 2018
Numerator For Basic And Diluted EPS:        
Net income $ 15,540 $ 11,144 $ 32,446 $ 21,708
Denominator for basic EPS:        
Weighted-average shares outstanding 20,383 20,221 20,326 20,178
Effect of dilutive securities:        
Diluted potential common shares (in shares) 283 372 309 405
Denominator for diluted EPS:        
Adjusted weighted-average shares outstanding 20,666 20,593 20,635 20,583
Basic EPS (in usd per share) $ 0.76 $ 0.55 $ 1.60 $ 1.08
Diluted EPS (in usd per share) $ 0.75 $ 0.54 $ 1.57 $ 1.05
Stock Appreciation Rights (SARs)        
Effect of dilutive securities:        
Dilutive effect of share-based compensation (in shares) 76 166 92 185
Restricted Stock Units (RSUs)        
Effect of dilutive securities:        
Dilutive effect of share-based compensation (in shares) 76 75 77 85
Performance Shares        
Effect of dilutive securities:        
Dilutive effect of share-based compensation (in shares) 131 131 140 135