Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Summary of Changes in Shareholders' Equity (Details)

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Shareholders' Equity - Summary of Changes in Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 03, 2015
Sep. 27, 2014
Oct. 03, 2015
Sep. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning of period     $ 228,177  
Foreign currency translation adjustment $ (196) $ (2,375) (3,410) $ (2,943)
Retirement liability adjustment – net of tax 161 110 484 318
Net income 24,694 $ 17,080 53,067 $ 37,731
End of period 283,986   283,986  
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning of period     252  
Conversion of Class B Shares to Common Shares     0  
Exercise of stock options     3  
End of period $ 255   $ 255  
Common Stock | Common Class Undefined        
Class of Stock        
Shares authorized 40,000,000   40,000,000  
Share par value $ 0.01   $ 0.01  
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning of period (shares)     16,608,000  
Conversion of Class B Shares to Common Shares (shares)     623,000  
Exercise of stock options (shares)     165,000  
End of period (shares) 17,396,000   17,396,000  
Common Stock | Convertible Class B Stock        
Class of Stock        
Shares authorized 10,000,000   10,000,000  
Share par value $ 0.01   $ 0.01  
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning of period (shares)     8,651,000  
Conversion of Class B Shares to Common Shares (shares)     (623,000)  
Exercise of stock options (shares)     108,000  
End of period (shares) 8,136,000   8,136,000  
Additional Paid-in Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning of period     $ 49,626  
Exercise of stock options     3,925  
Stock compensation expense     1,740  
End of period $ 55,291   55,291  
Accumulated Other Comprehensive Loss        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning of period     (11,949)  
Foreign currency translation adjustment     (3,410)  
Retirement liability adjustment – net of tax     484  
End of period (14,875)   (14,875)  
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning of period     190,248  
End of period $ 243,315   $ 243,315