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Retirement Plans (Tables)
 9 Months Ended
Oct. 01, 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 Nine Months Ended
 
 
October 1,
2016
 
September 26,
2015
 
October 1,
2016
 
September 26,
2015
Service cost
 
$
—

 
$
—

 
$
1

 
$
1

Interest cost
 
3,555

 
3,505

 
10,645

 
10,553

Expected return on plan assets
 
(4,775
)
 
(5,280
)
 
(14,326
)
 
(15,732
)
Net amortization and deferral
 
1

 
—

 
3

 
—

Recognized net actuarial loss
 
2,507

 
2,339

 
7,467

 
6,651

Net periodic expense
 
$
1,288

 
$
564

 
$
3,790

 
$
1,473