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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 27, 2020
Mar. 29, 2019
Numerator For Basic And Diluted EPS:    
Net (loss) income $ (3,103) $ 16,906
Denominator for basic EPS:    
Weighted-average shares outstanding 20,384 20,267
Effect of dilutive securities:    
Diluted potential common shares (in shares) 0 339
Denominator for diluted EPS:    
Adjusted weighted-average shares outstanding 20,384 20,606
Basic EPS (in usd per share) $ (0.15) $ 0.83
Diluted EPS (in usd per share) $ (0.15) $ 0.82
Stock Appreciation Rights (SARs)    
Effect of dilutive securities:    
Dilutive effect of share-based compensation (in shares) 0 107
Restricted Stock Units (RSUs)    
Effect of dilutive securities:    
Dilutive effect of share-based compensation (in shares) 0 83
Performance Shares    
Effect of dilutive securities:    
Dilutive effect of share-based compensation (in shares) 0 149