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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 26, 2020
Jun. 28, 2019
Jun. 26, 2020
Jun. 28, 2019
Numerator For Basic And Diluted EPS:        
Net income $ 6,678 $ 15,540 $ 3,575 $ 32,446
Denominator for basic EPS:        
Weighted-average shares outstanding 20,317 20,383 20,350 20,326
Effect of dilutive securities:        
Diluted potential common shares (in shares) 237 283 237 309
Denominator for diluted EPS:        
Adjusted weighted-average shares outstanding 20,554 20,666 20,587 20,635
Basic EPS (in usd per share) $ 0.33 $ 0.76 $ 0.18 $ 1.60
Diluted EPS (in usd per share) $ 0.32 $ 0.75 $ 0.17 $ 1.57
Stock Appreciation Rights (SARs)        
Effect of dilutive securities:        
Dilutive effect of share-based compensation (in shares) 36 76 36 92
Restricted Stock Units (RSUs)        
Effect of dilutive securities:        
Dilutive effect of share-based compensation (in shares) 63 76 80 77
Performance Shares        
Effect of dilutive securities:        
Dilutive effect of share-based compensation (in shares) 138 131 121 140