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Retirement Plans (Tables)
 3 Months Ended
Apr. 02, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of net periodic expense
The components of the net periodic expense for the Company’s pension plans, supplemental executive retirement plans ("SERP") and other postretirement benefit plans ("OPEB") are as follows (in thousands):

 
 
For the Three Months Ended
 
 
April 2,
2016
 
March 28,
2015
Service cost
 
$
—

 
$
—

Interest cost
 
3,545

 
3,524

Expected return on plan assets
 
(4,775
)
 
(5,226
)
Net amortization and deferral
 
1

 
—

Recognized net actuarial loss
 
2,480

 
2,156

Net periodic expense
 
$
1,251

 
$
454