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Earnings Per Share Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Oct. 02, 2015
Sep. 30, 2016
Oct. 02, 2015
Numerator For Basic And Diluted EPS:        
Net income $ 8,045 $ 7,392 $ 18,962 $ 25,443
Denominator for basic EPS:        
Weighted-average shares outstanding 19,957 20,087 19,996 20,128
Effect of dilutive securities:        
Diluted potential common shares (in shares) 235 296 213 330
Denominator for diluted EPS:        
Adjusted weighted-average shares outstanding 20,192 20,383 20,209 20,458
Basic (in usd per share) $ 0.40 $ 0.37 $ 0.95 $ 1.26
Diluted EPS (in usd per share) $ 0.40 $ 0.36 $ 0.94 $ 1.24
Performance Shares        
Effect of dilutive securities:        
Dilutive effect of share-based compensation (in shares) 83 60 61 53
Restricted Stock Units (RSUs)        
Effect of dilutive securities:        
Dilutive effect of share-based compensation (in shares) 82 113 86 103
Stock Appreciation Rights (SARs)        
Effect of dilutive securities:        
Dilutive effect of share-based compensation (in shares) 70 123 66 174