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Retirement Plans (Tables)
 3 Months Ended
Apr. 01, 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
 
 
April 1,
2017
 
April 2,
2016
Service cost
 
$
—

 
$
—

Interest cost
 
3,271

 
3,545

Expected return on plan assets
 
(4,636
)
 
(4,775
)
Net amortization and deferral
 
1

 
1

Recognized net actuarial loss
 
2,612

 
2,480

Net periodic expense
 
$
1,248

 
$
1,251