Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details)

v2.4.0.6
Shareholders' Equity (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Summary of changes in shareholders' equity    
Beginning of Period $ 125,134  
Stock Compensation Expense 326 318
Foreign Currency Translation Adjustments (197) 110
Mark to Market Adjustments for Derivatives 15 23
Retirement Liability Adjustment 106 (3,727)
Net Income 8,564 6,095
End of Period 134,142  
Convertible Class B Stock [Member]
    
Summary of changes in shareholders' equity    
Shares Authorized 5,000  
Share Par Value $ 0.01  
Common Stock [Member]
    
Summary of changes in shareholders' equity    
Shares Authorized 20,000  
Share Par Value $ 0.01  
Beginning of Period 145  
Beginning of Period, Shares 10,865  
Conversion of Class B Shares to Common Shares 258  
Exercise of Stock Options, Shares 30  
End of Period 145  
End of Period, Shares 11,153  
Common Stock [Member] | Convertible Class B Stock [Member]
    
Summary of changes in shareholders' equity    
Beginning of Period, Shares 3,596  
Conversion of Class B Shares to Common Shares (258)  
Exercise of Stock Options, Shares 17  
End of Period, Shares 3,355  
Additional Paid in Capital [Member]
    
Summary of changes in shareholders' equity    
Beginning of Period 22,883  
Stock Compensation Expense 326  
Exercise of Stock Options, Value 194  
End of Period 23,403  
Accumulated Other Comprehensive Loss [Member]
    
Summary of changes in shareholders' equity    
Beginning of Period (4,783)  
Foreign Currency Translation Adjustments (197)  
Mark to Market Adjustments for Derivatives 15  
Retirement Liability Adjustment 106  
End of Period (4,859)  
Retained Earnings [Member]
    
Summary of changes in shareholders' equity    
Beginning of Period 106,889  
Net Income 8,564  
End of Period $ 115,453