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 6 Months Ended
Jul. 04, 2015
Jun. 28, 2014
Jul. 04, 2015
Jun. 28, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning of period     $ 228,177  
Foreign currency translation adjustment $ 432 $ (182) (3,214) $ (568)
Retirement liability adjustment – net of tax 162 106 323 208
Net income 17,690 $ 13,144 28,373 $ 20,651
End of period 256,148   256,148  
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning of period     219  
Conversion of Class B Shares to Common Shares     0  
Exercise of stock options     3  
End of period $ 222   $ 222  
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)     569,000  
Exercise of stock options (shares)     94,000  
End of period (shares) 17,271,000   17,271,000  
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)     5,322,000  
Conversion of Class B Shares to Common Shares (shares)     (569,000)  
Exercise of stock options (shares)     102,000  
End of period (shares) 4,855,000   4,855,000  
Additional Paid-in Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning of period     $ 49,659  
Exercise of stock options     1,343  
Stock compensation expense     1,143  
End of period $ 52,145   52,145  
Accumulated Other Comprehensive Loss        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning of period     (11,949)  
Foreign currency translation adjustment     (3,214)  
Retirement liability adjustment – net of tax     323  
End of period (14,840)   (14,840)  
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning of period     190,248  
Net income     28,373  
End of period $ 218,621   $ 218,621