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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 30, 2013
Employee Benefit Plans [Abstract]  
Components of net periodic benefit cost and assumptions used
The components of the net periodic benefit cost for the pension benefits and other benefits plans are as follows:

   
Three Months Ended
  
Three Months Ended
 
(In thousands)
 
March 30, 2013
  
March 31, 2012
 
   
Pension
Benefits
  
Other
Benefits
  
Pension
Benefits
  
Other
Benefits
 
              
Components of Net Periodic Benefit Cost:
          
Service cost
 $263  $53  $262  $39 
Interest cost
  301   70   320   58 
Expected return on plan assets
  (381)  (13)  (394)   
Recognized net actuarial loss
  151   21   154   9 
Amortization of prior service cost
  14   21   14   5 
Net periodic benefit cost
 $348  $152  $356  $111 
                  
The weighted average assumptions used to determine net periodic benefit cost are as follows:
 
                  
Discount rate
  3.89%  3.92%  4.28%  4.43%
Expected long-term return on plan assets
  5.75%     6.25%   
Rate of compensation increase
  3.50%  3.67%  4.00%  3.48%