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Retirement Plans (Tables)
 6 Months Ended
Jul. 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
 
For the Six Months Ended
 
 
July 2,
2016
 
June 27,
2015
 
July 2,
2016
 
June 27,
2015
Service cost
 
$
—

 
$
—

 
$
—

 
$
1

Interest cost
 
3,545

 
3,524

 
7,090

 
7,048

Expected return on plan assets
 
(4,775
)
 
(5,226
)
 
(9,550
)
 
(10,452
)
Net amortization and deferral
 
1

 
—

 
2

 
—

Recognized net actuarial loss
 
2,480

 
2,156

 
4,960

 
4,312

Net periodic expense
 
$
1,251

 
$
454

 
$
2,502

 
$
909