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Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2017
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
 
 
September 30,
2017
 
October 1,
2016
 
September 30,
2017
 
October 1,
2016
Service cost
 
$
1

 
$
—

 
$
1

 
$
1

Interest cost
 
3,305

 
3,555

 
9,847

 
10,645

Expected return on plan assets
 
(4,635
)
 
(4,775
)
 
(13,907
)
 
(14,326
)
Net amortization and deferral
 
2

 
1

 
4

 
3

Recognized net actuarial loss
 
2,630

 
2,507

 
7,854

 
7,467

Net periodic expense
 
$
1,303

 
$
1,288

 
$
3,799

 
$
3,790