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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 29, 2018
Jun. 30, 2017
Jun. 29, 2018
Jun. 30, 2017
Numerator For Basic And Diluted EPS:        
Net income $ 11,144 $ 7,313 $ 21,708 $ 10,363
Denominator for basic EPS:        
Weighted-average shares outstanding 20,221 20,012 20,178 19,991
Effect of dilutive securities:        
Diluted potential common shares (in shares) 372 335 405 357
Denominator for diluted EPS:        
Adjusted weighted-average shares outstanding 20,593 20,347 20,583 20,348
Basic EPS (in usd per share) $ 0.55 $ 0.37 $ 1.08 $ 0.52
Diluted EPS (in usd per share) $ 0.54 $ 0.36 $ 1.05 $ 0.51
Stock Appreciation Rights (SARs)        
Effect of dilutive securities:        
Dilutive effect of share-based compensation (in shares) 166 125 185 152
Restricted Stock Units (RSUs)        
Effect of dilutive securities:        
Dilutive effect of share-based compensation (in shares) 75 102 85 102
Performance Shares        
Effect of dilutive securities:        
Dilutive effect of share-based compensation (in shares) 131 108 135 103