Pension and Retirement Plans (Tables)
 3 Months Ended
Mar. 29, 2015
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of net periodic benefit cost
The following represents the components of net periodic (benefit) cost:
 
 
Three months ended
Pension Benefits
March 29,
2015
 
March 30,
2014
Interest cost
2,828

 
2,902

Expected return on assets
(3,391
)
 
(3,292
)
Amortization of:
 
 
 
Actuarial loss
269

 
32

Net periodic benefit
$
(294
)
 
$
(358
)